Leader strategies for motivating innovation in individuals: a systematic review

Innovation is a topic of intense interest and is seen as key to confronting the vast majority of issues facing humanity. To consolidate the knowledge about approaches promoting innovation, this study conducted a systematic review integrating an all-database (n = 375) search through EBSCOhost completed on April 6th, 2019 in addition to search engine use. Three hundred three studies were full-text reviewed yielding 82 final studies eligible for the inclusion in findings extraction. The findings were synthesized and then organized into the Expectancy–value–cost (EVC) motivation framework to isolate promotive and hindering factors. It is clear that there is an unbalanced primacy in the innovation literature in favor of business and corporate settings with very little representation from the arts or social justice sectors. There is also a common trend of using surveys of individuals in organizations within a single discipline, while interviews are rare. The paucity of studying costs of innovation in the literature is symptomatic of the primarily positive psychology approach taken by studies, rather than a framework like EVC which also considers detractive factors like costs. Numerous studies provide support for the notion that more internal motivations like intrinsic (e.g., interest) and attainment (e.g., importance, fulfillment) were more influential than external motivators like rewards as targets of strategies. Leaders should focus, whenever possible, on topics that engaged curiosity, interest, and satisfaction and, if they choose to use rewards, should focus their strategies to give related rewards; otherwise, they risk sundering the internal motivation to innovate for already interested workers.


Introduction
Innovation is key to confronting the vast majority of issues facing humanity. It can be defined variously and tends to include problem-solving processes (Cramond & Fairweather, 2013), executing novel ideas to create societal value (Soleas, 2018a) and applied creativity . The capacity to refine existing ideas and challenge existing ideas is a very important and thankfully human process drawing intense interest from a range of disciplines including psychology (e.g., Carr, Kendal, & Flynn, 2016), business (e.g., De Clercq & Pereira, 2019), and education (e.g., Soleas, 2020), among many others. The importance, variety, and outcomes of writing, the nebulous state of the literature remains siloed among different disciplines, and there has yet to be a cogent amalgamation of the research elucidating what motivates innovators in one place. What interventions can reduce the costs of innovating to the point where more learners are willing to give it a try? A systematic and twopronged approach of evaluating the literature offerings on both promotive and hindering motivation factors promises a holistic view of the decision maker and teaching approaches that make innovation more likely and hindering factors that need to be addressed to make the most of promotion.
A typical literature review did not reasonably capture all the necessary information from such varied fields including business, education, and psychology, to name a few. Thus, a review that would be systematic, replicable, and thorough would be ideal to address this concern (Liberati et al., 2009; The Campbell Collaboration, 2017). Systematic reviews are structured literature reviews where researchers retrieve and evaluate all available evidence on a given topic; they synthesize, categorize, and appraise all the extant knowledge pertaining to a topic of inquiry. In this case, the review sought all articles through an EBSCOhost all-database search on approaches for promoting individuals' capacity to innovate. As a result of innovation knowledge and, hence, promotion being spread across the many contributing disciplines, a siloing effect has occurred. To span these disciplines and evaluate all the knowledge currently available about approaches promoting innovation, a review that would be systematic, thorough, and replicable would be ideal to address this concern (Liberati et al., 2009; The Campbell Collaboration, 2017). A systematic review of the literature would provide the necessary insights to inform the design of approaches that would promote innovative behavior of aspirants.

Methodology
For structuring the review, protocols as recommended by the Campbell Collaboration, a social sciences international collaboration that regulates and supports the conductance of rigorous systematic reviews of interventions in education and other settings were used (The Campbell Collaboration, 2017). In this case, this registered systematic review (osf.io/up83s) consolidated and analyzed empirical studies about the approaches for supporting innovation, which includes strategies, practices, interventions, and curricula, guided by the following research questions: 1. What does the existing literature tell us about strategies that motivate and sustain human innovative behavior? a. What is found in the literature about strategies that build expectancies of individual innovative behavior? b. What is found in the literature about strategies that build individual-held subjective task values of innovative behavior? c. What is found in the literature about strategies that mitigate the perceived costs of individual innovative behavior?
with human participants that examined the motivations of individuals as a unit of analysis were included. Additionally, only English-language articles and articles with verified English-language translations were considered. There were no restrictions on the years of included studies with the earliest studies dating back to 1967, and the most recent published in early 2019. Specific consideration was given to the design of strategies that build expectancies and values, and those that help mitigate the perceived and unperceived costs or risks of innovative behavior. This systematic review followed an all-database (n = 375) search through EBSCOhost performed on January 2nd, 2018 and again on April 6th, 2019, in addition to Google and Bing search engine use (see Fig. 1).
When contacting authors of included papers for additional sources to consider, there were no date-of-publication restrictions. One hundred twenty six additional studies from outside the database search were obtained this way, while an additional 85 studies were found to be already included in the search and removed as redundant. Database searching was concluded on April 6th, 2019, and the last of the article-yielding author replies was retrieved by February 1st, 2019 (see Fig. 2). The database searching was performed in early 2018, but subsequent searches updating with more recent articles were performed in April 2019 to include the most modern articles.

Search strategy
In Abstract AND Paper: Innovat* AND (Motiv* OR Promot* OR Support*) AND (Strateg* OR Approach* or Interven*). Related word substitutions are allowed.
Using Boolean logic, the addition of an asterisk would tell the database to search for all permutations of the rest of the word. For example, motiv* would tell the database to search for motivation, motivator, motivate, motivating as related terms as well as synonyms like encourage, prompt, etc. As secondary search procedures, Google and Bing were also searched using an analogous process with Boolean search code operators. As well, email addresses of authors were extracted and these authors were contacted, resulting in 126 previously undiscovered prospective studies after eliminating redundant duplicates.
Research assistants were employed to facilitate the screening process by abstract and title. Study reviewers operated in dyads, with each member doing independent reviews of each abstract and title by deciding whether the title would be relevant and within the inclusion criteria. Each abstract and title was therefore reviewed twice for the purposes of adjudicating inclusion or exclusion. Disagreements were resolved through the study being included in the full paper review to avoid removing a potentially eligible study. Cohen's Kappas were calculated using the tabulated data in the aggregate review (see Table 1). The Kappa value (0.806) indicates very good agreement among the reviewers. Three hundred three studies were full-text reviewed, of which 82 final studies were determined to be eligible for inclusion in findings extraction. Findings were extracted from the final papers using qualitative data analysis software, Atlas.ti v8.0. In this way, salient hypotheses, methodologies, findings, conclusions, participant data, and other articles for consideration were isolated from the full-text files. From the methodology, the paradigm (e.g., qualitative, quantitative, or mixed methodology) and tradition (e.g., case study, experimental design, or pre-/post-test) were isolated and extracted.

Demographics of the literature results
Business workers and employees were the most common study participants (40.2%), followed by students (19.5%), business leaders (10.97%), consumers (10.97%), teachers (9.76%), and entrepreneurs (8.53%; see Table 2 for a complete listing of studies by participant type). Many studies examined the activities of managers or leaders as crucial for promoting the innovative behavior of other workers. For simplicity's sake, the term leader will be used going forward for individuals who influence subordinate, worker, or learner groups in their care. In the case of schools, leaders would be those leading classes, namely teachers and administrators.
When comparing the results of analyzing articles by discipline, the disciplinary breakdown of articles mirrored the findings of Soleas (2018b) including the disproportionate representation of innovation conceptualized from business disciplines (56.09%) such as  Table 1 Screening phase: review of titles and abstracts with relative agreement as indicated by Cohen's Kappa
The vast majority of studies in the sample were quantitative (71.95%), with qualitative as a sizable minority (19.51%), and mixed method studies as the rarest (8.54%; see Table 4 for a complete study listing by methodology type).
In terms of research design, surveys were by far the most common design (62.19%), followed by case studies (13.41%), experimental and quasi-experimental designs (9.75%), interviews (9.75%), and then meta-analyses (4.88%; see Table 5 for a complete listing by design).
Results for expectancies in the literature: Can I do this?
Innovation stands as an interesting case for EVC as the factors that might potentially motivate innovation are numerous. This study organizes the findings into the EVC framework to cluster together adjacent strategies that would focus on building learner confidence to innovate. In terms of the expectancies (self-efficacy and self-concept; see Bandura, 1986Bandura, , 2001Bandura, , 2006Wigfield, 1994), persons who grow to see themselves as potentially able to innovate because of an acquired efficacy or confidence would typically hold a higher expectation of themselves to be able to innovate and. thus, become more invested in the task of innovating. Higher investment in the task results in a higher degree of motivation sourced from the self-held conviction that the individual can innovate. This theme focused on the strategies used by leaders to help learners engage in the task so that they could build their confidence. This establishes a foothold for further growth, as a growing expectancy of success begets further growth of the skill in innovation and elsewhere. This theme consolidates the research pertaining to the building of confidence and the strategies that a leader could integrate into their decision-making to better stoke innovation. Leaders and managers in organizations assigning simpler innovation tasks early in a program and then building to harder problems according to this logic line should steadily build esteem and self-efficacy.

Strategies for building expectancies
Researchers have considered a wide range of expectancy-building strategies to promoting innovation and have studied the effects that careful managerial planning, engagement seeking, experimentation, teaching the process of innovating, management style, collaboration, available support, and training would have on the confidence and selfefficacy of innovators. The research on strategies for motivating innovation tended to be specific to disciplines and typically use survey methodologies of workers in businesses rather than specifically probing the motivations of innovators. Leader strategies include careful managerial planning, encouraging experimentation, managerial style, fostering collaboration, and providing supports.

Careful planning and engagement seeking
The literature on promoting innovation tended to come from business settings and proposed that a key consideration for actively stoking confidence to innovate was careful managerial planning, with specific consideration of consistent efforts maximizing  Soleas Journal of Innovation and Entrepreneurship (2020) 9:9 Page 9 of 28 engagement opportunities. These efforts were found by some studies to be most fruitful when they led to informal or even improvised activities (Song, Im, Van Der Bij, & Song, 2011). Monge et al. (1992) found that careful managerial planning of meetings as well as cognizance of the peaks and troughs throughout yearly or periodic cycles were   Soleas Journal of Innovation and Entrepreneurship (2020) 9:9 Page 12 of 28 necessary; otherwise, employers risked shorting the confidence of participants to innovate. Similarly,  found that managers need to carefully consider that no matter how innovative a person might be over time, innovation fatigue can set in unless confidence is sufficiently stoked.
Research has identified the importance of careful managerial planning as key to the maintenance and encouragement of worker engagement and thereby confidence, such as information days, group goal setting, and stakeholder consultations   2014) pointed to the need for managers to provide practical tools and structures for these engagement efforts such that they became habitual and a part of organizational muscle memory. In short, managers and those in supervisory roles need to take explicit and thoughtful action to build and sustain the confidence to innovate of those in their employ.

Leader encouraging experimentation and innovators learning through experience
Research that examined strategies that built innovation confidence through the encouragement of experimentation tended to come from business settings and primarily consisted of survey studies.  found that providing opportunities for experimentation coupled with feedback loops in work situations tended to build the expectancies of workers to innovate. Other studies found that experimentation was facilitated through the work environment and by the flexible allocation of work tasks that tolerated early failures ( These same studies found that this early investment of time and resources for pilot testing or at least tolerance of early mistakes overwhelmingly tended to yield long-term success in excess of less tolerant attitudes towards experimentation. In the same vein, problem finding, problem clarification, and problem-setting were found to be effective catalysts for experimentation (Füller et  . These initiatives were commonly found to be most effective when coupled with systematic evaluation strategies (Messmann & Mulder, 2014;.  found that experimentation spurred innovative activity because it suited employee preference to feel in control over their actions. This recognition of the desire of innovators to be self-determining is congruent with the findings of decades of self-determination theory research (e.g., Deci & Ryan, 1987;Ryan & Deci, 2017). In summary, the contemporary thinking on encouraging experimentation is that it can be coupled with preliminary thinking exercises, consistent feedback, and then post-experimental systematic evaluations to be maximally effective in building innovators' confidence, and thereby supporting innovation.

Leadership style: the effects of having innovation champions
Research within the business field has identified leadership style and the efficacy of champions as key-innovation confidence-building tools. Leaders who boldly pursued . While a majority of studies found that the effect of champions was significant, Chen, Li, and Leung (2016) pointed out that two recent meta-analyses revealed that champions only had a small effect on the quantity of innovation by individuals. Naidoo and Sutherland (2016) gave nuance to this finding by determining in their sampling that the reported quality of innovations was increased rather than quantity when groups were led by champions. In summary, leaders who promoted confidence to innovate tended to provide the resources and spaces for innovation to occur and tended to lead efforts personally and model innovative behavior rather than delegating.

Collaboration
By far, the most common theme among analyzed research reports and papers and across disciplines was the widespread finding that collaboration served as a strategy for promoting innovation through building confidence (e.g., Bastian  While research has identified the significant benefits and articulated some risks of misusing collaboration, studies have shown that team chemistry is a key consideration in reaping the maximal benefit of collaboration to motivate innovation.  identified that loose or informal team formation decreased the confidence of the individuals in a group as well as the efficacy of the group. As well, striking a balance of collaboration and competition in a given work environment was seen as a way to make the most of team work while also encouraging accountability . Mehta et al. (2008) found that while it is often best to have a mixture of motivations and attitudes on teams when working under strict timelines or with budgetary concerns, having homogenous groups is typically the better decision. Indeed, actor diversity helps to ensure that many ideas are represented when working in teams ( (2017) extends actor diversity to recommend that teams be composed of innovators and noninnovators in a hammer and anvil model, where innovators strike ideas and noninnovators provide support and stability. In summary, contemporary research on collaboration as a tool to support innovation has identified that it has a wide range of significantly impactful benefits but needs to be applied with caution, as too much dependence on collaboration can result in a decrease of accountability. In addition, optimal team composition is extremely sensitive to the personalities of the members and the goals of the innovation.

Support
Support was a consistent consideration of research examining strategies that build expectancies and confidence to innovate (e.g., Kuznetsov  Studies also examined the importance of feedback as a support that increased individual and group confidence when innovating (Demircioglu & Audretsch, 2017;Ford, 1999;. Other supports included innovation policies (Ozorhon & Oral, 2017), active inclusion of a problem-solving curriculum , and actively enforcing a high quality of life balance Sorice & Donlan, 2015).
In summary, supports were widely positioned as methods or tools to build confidence and heuristics to make innovation as a process easier; these supports tended to divide innovation into manageable segments, scaffold the process of innovating, and, otherwise, decrease the costs of innovation. These strategies were typically identified in the discussions of studies, rather than as the subjects of studies, and often lacked a concrete explanation as to what these supports would look like. For example, while an innovation supportive culture, climate, or policy was often identified as a necessary factor in building confidence to innovate, explanation and articulation of what constituted such a culture, climate, or policy remained sparsely defined.

Results for perceived values: What makes innovation worth doing?
Individuals tend to act in accordance with the perceived values that they see in the tasks at hand (Feather, 1992). The three value types such as intrinsic, attainment, and utility subjective task value lend themselves well to an analysis of a phenomenon like innovation, as it is perceived differently by different people with different values (Green, 2013). For instance, individuals might have a very different attainment valence than their peers regarding innovation. Some might see innovation as having a very high attainment value as it is of central importance to their sense of self or in constructing their identity. Similarly, innovation as an act may hold intrinsic value to some people as they enjoy the act of applying their ideas. People tend to be motivated to complete activities that they enjoy; hence, if they enjoy the task of innovating and its subtasks they are likely to continue to do so (intrinsic value). But what if an individual does not enjoy innovation yet still is motivated? This motivation might be a utility value. Even if people think they can innovate, they might not have the motivation to innovate unless they see what is in it for them. Innovation is often richly rewarded in society, even if many think innovation is a buzzword (Green, 2013;Lehmann-Ortega & Schoettl, 2005). This reward can be in the form of monetary pay, public recognition, and fame, although it varies widely by context. The lure of these rewards can beget a value for which individuals can strive, giving the act of innovation an inherent value for the individual who seeks these rewards. Of all these forms of value motivation, intrinsic is hypothesized to be the most powerful and most desired across a majority of contexts (Deci et al., 1999); however, the relative potency varies from individual to individual.

Intrinsic task value
Intrinsic task value is the subjective value of a task for enjoyment, interest, or fun (

Strategies for building intrinsic value
The lone strategies found in the literature were to foster the interests and encourage the drive of individuals who undertook innovative endeavours.
Interest, enjoyment, and novelty seeking as means to create drive The few strategies that studies examined pertaining to stoking innovation through intrinsic task value focused solely on feeding individuals' interest and drive. Strategies that motivated innovation tended to be enjoyable and, hence, very much specific to the interest of the participants (e.g., Antikainen  The findings of the studies point to efforts to make meetings, programs, and work settings to be enjoyable through curated informal settings. Additionally, understanding that flexibility of choice and leader-led efforts to make tasks enjoyable tended to increase the intrinsic task value of a given task.
Personal interest and curiosity were found to be powerful motivators for innovation  In summary, wherever possible, efforts should be made to strategically allocate personnel to tasks that they would find interesting.
Strategies that supported innovation were found to feed the novelty-seeking behavior of many innovators. Studies suggested task variety (Duverger, 2012;Montani et al., 2014), thrilling goals , imaginative involvement , and new experiences Wang et al., 2011) as motivating innovation. Leaders making the efforts to design their strategies to provide these opportunities tended to fulfil intrinsic task value through fulfilling the "need for new" that many innovators feel.

Attainment value
Attainment task value is the value perceived as a result of completing a task; this aligns with the internal extrinsic motivation of the Self-determination theory (Ryan & Deci, 2017).

Strategies for building attainment value
Attainment value was a frequent finding in the literature on motivation to innovate. Common trends for promoting attainment value included strategies like fostering autonomy, investment, recognition, optimized challenge, and perceived importance of innovative endeavors.
Autonomy Strategies for building autonomy focused on judicious delegation of decision-making processes and allowing workers to make planning decisions . Another tactic was encouraging followers to develop with new ideas and put them into practice as a means of fuelling initiative (Yidong & Xinxin, 2013). Shane et al. (2003) argued that initiative building facilitated the added benefit of encouraging workers to think of themselves as being capable, and this made innovation seem more valuable. While articles highlighted that providing autonomy was a way to increase the attainment value of innovation, the exact mechanism does not seem to be fully understood beyond the indication that giving people choice makes them more likely to commit to their new ideas.
Investment Studies pointed to strategies that built investment to be highly effective in promoting innovation. These strategies included decision-making being proportional to the amount of investment in corporations where the board held a controlling interest in the company . When boards made up of employees held a controlling interest, innovation was more common than when they did not. Similar non-corporate situations where the decision makers were personally and sometimes monetarily invested in the outcome of an endeavor tended to also be more likely to support innovation Wendelken et al., 2014). In situations where individuals were personally invested in their endeavors, innovation tended to increase.
Recognition Recognition, past, present, and future was found to be an important consideration when making efforts to motivate innovating. Research has shown that motivation to gain reputation was a central consideration of many aspiring innovators in the public domain Zheng et al., 2011), and in the private business (Antikainen & Vaataja, 2010; du Toit, van Staden, & Steyn, 2011) and for teachers implementing problem-solving initiatives in their classrooms . This consideration was articulated as a combination of recognition of status, peer-respect dynamics, and enhancement of professional status (Fernandez & Pitts, 2011;Wendelken et al., 2014). Recognition of innovative efforts in the literature was split between being reported as a decisive factor in some articles, while not being a great consideration in others indicating that further study is needed to determine the dynamics mediating other factors.
Self-improvement, achievement, and optimized challenge Research has also examined strategies for motivating innovation that involved feeding the desire of aspiring innovators to improve themselves. This strategy has been described as feeding a self-improvement drive . Leaders seeking to stoke innovation could infer from the literature that making the time to articulate the goals of an innovation and the way that it could benefit workers and society will increase engagement and increase the attainment value of the activity thus propelling the innovating of individuals and teams.

Strategies for building utility value
The lone strategy explored in the literature to build utility value was through the medium of rewards. Rewards were, however, an extremely common theme in the literature being explicitly and implicitly examined in a majority of studies.   found that in higher education contexts, external rewards like grants were seen as necessary evils that created the space to innovate. Thus, the reward was a means to an end and not the desired outcome itself. The results of other studies supported this view of rewards as tools for creating space and opportunities for innovating Xie & Reider, 2014). However, other studies pointed to the lack of empirical evidence on types of rewards outside of business case studies . The few studies on the empirical evidence of rewards argued that the most effective rewards tended to not be immediate in time, or directly in the form of monetary rewards (Baranchuk et al., 2014;. Rather, rewards with a longer vesting period or with a longer duration before payoff tended to be more effective (Baranchuk et al., 2014;Lerner & Wulf, 2018). As a final level of complexity,  and  found that the timing of rewards made a dramatic difference in the success of the innovation with early funding and rewards being much more effective in propelling innovations to success.

Rewards
Indirect rewards work better than direct rewards The findings of some studies offer nuances to this understanding, reflecting that while monetary rewards and other extrinsic motivators generally worked at some level, they were not as necessary as other motivations like career aspirations, fulfillment, interest, or non-monetary rewards. These in tandem with changes to organization or administration were considered to be more   found that pay-forperformance or high salaries were ineffectual in stoking the motivation to innovate, whereas indirect pay such as benefits or group pay increased motivation to innovate, findings corroborated elsewhere in the literature Lerner & Wulf, 2018;. The lone study to make concrete recommendations for indirect rewards was  who found that family health benefits, excursions, additional resources for their goal, and allowances for professional development were effective indirect rewards. Similarly, to the short-term rewards, performance pay was found to induce the feeling of being controlled, instigating decreased motivation to innovate; whereas, long-term goals created autonomous motivation .
Variety of rewards Further still, some studies found that outcome rewards in any form were detrimental to the motivation to innovate Poskela & Martinsuo, 2009). These other studies' results tended to find that including a variety of rewards was the best strategy if rewards were necessary Cordero et al., 2005;Maria Stock et al., 2017).  found that it was sometimes possible to increase innovation with compensation, but only with the correct compensation, which connects to the arguments of Hopkins (2016), who calls for material, communal, or related incentives to foster innovative behavior.  analogously found that the major predictor of the efficacy of rewards was having a variety of rewards, findings echoed in those of other studies Cordero et al., 2005;. In a study of innovation for participants and nonparticipants, the non-participants placed the most emphasis on monetary rewards, while the innovator participants placed more emphasis on other more internal motivators . In summary, there is substantial evidence in the literature that monetary rewards may not attract the desired motivations, and that the best course of action would be to offer a variety of rewards.

Results for cost in the literature: What is between me and what I want?
Whereas, expectancies and values are promotive constructs, costs are the hindering factors that make a task, in this case, innovation, less likely. The strategies discussed here are for mitigating the costs of innovating, such that there is more room for leaders to use expectancy and value-building strategies to motivate innovation. Diminishing the potential intrinsic, attainment, and utility value of innovating is the inherent costs of being an innovator. Innovation, like other complex tasks, while potentially rewarding, also has contextual material and psychological costs, such as additional effort, investment of time, pressure, the implications of failure, and loss of both relative stability from the status quo and availability of other options (Flake et al., 2015). For instance, the process of innovating may very well require the investment of additional time and resources to design and operationalize. However, doing things as they have been done in the past does not. The cost of the additional resources may serve to lessen the motivation or diminish the value of innovating. Innovation may itself place the individual or collaboration under pressure that may be undesirable for some individuals (Flake et al., 2015;Vansteenkiste et al., 2005;Wang et al., 2018). Innovation has been portrayed as a risky pursuit because of the possibility of failure, the stigma of being different, and a threat to the status quo (Green, 2013;Lehmann-Ortega & Schoettl, 2005). Even if someone innovates, the idea might not hold the same value to other people. Innovation does have a cost. To some, it constitutes the loss of non-innovative alternatives. To promote innovation development, the expectancies and values must exceed the costs, and this balancing act may be facilitated by the use of strategies or the design of environments.

Strategies for managing costs
In the literature, successful strategies for motivating innovation considered the costs of innovation including risk aversion and unbalanced focus on financial rewards. Costs are, by far, the least defined and studied strand from an EVC perspective on motivating innovation. Strategies informed and actively designed to mitigate the costs of innovation as identified in the findings of studies tended to be the most successful.

Risk aversion
Studies promoting innovation demonstrated that a crucial conundrum is the mitigation of the perception of risk; innovation is seen as a risky thing by many aspirants (Kinney et al., 2015;Phillips, 2004;. Study results pointed to risk as being needed to be managed by leaders for innovative behavior to occur showing that lack of risk aversiveness is shown to decrease motivation; however, risk acceptance was not shown to be particularly motivating. Risk acceptance is only visible in its absence; hence, it is a cost mitigation factor rather than an expectancy. Research into the effects of risk on innovation was limited to directionality and the consensus is that the magnitude of risk deters innovative behavior. However, this synthesis offers little insight into the strategies that leaders could use to mitigate the impact of risk.

Obsession with financial rewards
While financial incentives were hypothesized to have some positive benefits such as increasing interest, an organization or group with too much of a focus on monetary rewards actually increases the cost of innovating as a result of the cutthroat behavior of some workers (Sorice & Donlan, 2015). To combat this, extrinsic rewards once utilized need to be used with increasing frequency and magnitude (Bessonova & Gonchar, 2017; Maria Stock et al., 2017; Sorice & Donlan, 2015) in a manner that seems reminiscent of a pattern of addiction. To have the same effect, increased amounts of rewards needed to be utilized to sustain the pattern of behavior.

Discussion
It is clear that there is an unbalanced primacy in the innovation literature in favor of business and corporate settings with very little representation from the arts or social justice sectors. There is also a common trend of using surveys of individuals within a single discipline, while interviews are rare. Although there is an emergent field of study on innovation education, this field has yet to consider the unique motivation of aspiring innovators. At the moment, innovation promotion is still very much disciplinary and siloed as shown by the complete absence of interdisciplinary research on environments or strategies. The gaps in understanding the effects of various environments and strategies are detrimental to efforts to support innovation. The paucity of studying costs of innovation in the literature is symptomatic of the primarily positive psychology approach taken by studies, rather than a framework like EVC which also looks at detractive factors like costs. Efforts to support innovation in a variety of settings including education need to have a deeper understanding of the costs and prices paid by innovators so that they can be mitigated and addressed.
In terms of methodology, the field is dominated by surveys of employees in business settings, rather than of bonafide innovators. This focus on survey research precludes the possibility of having concrete details and rich articulation of narration from innovators on their thinking. Another manifestation is the lack of specific strategies across the strategies and environments as the literature tends to focus on measurable outcomes rather than the latent considerations that underpin the decisions that aspiring innovators make and the supports and barriers that they consider. The literature offers many ideas about what motivates innovation, but there has been very little open-ended investigations directly asking innovators what factors motivated them to reach for their prospective goals, nor are innovators effectively asked about their education. For this reason, additional research is required to investigate the specific motivations of innovators in a variety of disciplines.
Numerous studies provide support for the notion that more internal motivations like intrinsic (e.g., interest) and attainment (e.g., importance, fulfilment) were more influential than external motivators like rewards as targets of strategies (Aarikka-Stenroos et al., 2017; Fernandez & Pitts, 2011). In an experimental study,  found that pay for performance actively inhibited innovation precursor behaviors such as exploration and resulted in significantly fewer innovative events as compared to conditions where exploration was rewarded. Namely, internal motivations were more effective as they were not seen as being as controlling as external rewards showing that individuals tend to see through direct rewards and recognize them as forms of external control (Aarikka-Stenroos et al., 2017; Fernandez & Pitts, 2011; Gorozidis & Papaioannou, 2016;Jermias, 2007). That being said, the more related the reward is to the activity itself in terms of subject matter, the more effective the reward is in promoting the desired behavior Fernandez & Pitts, 2011). Rewarding someone who enjoys reading by giving them money would reduce internal motivation and might actually decrease the amount they read, as compared to rewarding someone for reading by giving them another book. These findings are supported by a history of research in the motivation literature (e.g., Kruglanski et al., 1975;Kruglanski et al., 1971;Ryan & Deci, 2017) , showing that the nascent research into reward effect on promoting innovation has research precedent elsewhere.
Leaders were urged to focus on topics that engaged curiosity, interest, and satisfaction Shane et al., 2003;Wang & Huang, 2015;Wu et al., 2013). These strategies recommended that leaders only assign topics to innovators that were of interest to them. Such strategies would not be applicable in many situations where the topic is not flexible. Additional research is needed to determine how intrinsic task value can be applied in situations where topics are not intrinsically interesting for innovators as well as to determine the mechanisms of intrinsic value and how it works to motivate innovation.
Forward-thinking companies exemplified in the literature had moved away from direct rewards like monetary bonuses and had instead moved towards recognition and indirect rewards like vacation time, paying for the professional development of the employee's choosing, and flexible work time Gopal & College, 2011). The general trend among studies is that internal motivations and rewards that have longer vesting times or feed interest or attainment operate effectively long-term, while external motivations like direct rewards or pay for performance tend to have short-term effects that are reliant on consistent rewarding of behavior and can even actively hinder innovation. Leaders, if they choose to use rewards, should focus their strategies to give related rewards; otherwise, they risk sundering the internal motivation to innovate for already interested workers.

Conclusion
This manuscript consolidates the available knowledge from for leader-driven strategies for motivating innovation. By doing so, it provides avenues for discussion and ideas for implementation by leaders in context who seek to promote innovation. It identifies patterns from a range of disciplines to break the siloing of knowledge from different innovation-related areas of endeavor and makes it available for innovation promotion efforts. The most effective leader approaches to making innovation more likely combine maximizing promotive factors while also addressing and mitigating hindering factors. Effective leaders in organizations actively maximize confidence of their workers and account for the values that they see in innovating. These effective leaders in conjunction with approaches that promote innovating make decisions that mitigate or reduce the perceived costs of innovating. The optimal use of rewards in the workplace and learning setting are related to the task and are often not direct performance pay. This work points to the most effective approaches to motivating innovation being those that proactively build expectancies and values, while continuously working to mitigate the costs of innovating.
Abbreviation EVC: Expectancy-value-cost theory . A major theory of motivation that theorizes that the motivation for a task is the function of the expectancies (expectations of success, confidence, and self-efficacy) and the values (a direct or indirect, tangible or intangible benefit for performing the task) balanced against the perceived costs of performing the task.