To effectively address the Sustainable Development Goals (SDGs), modern STEM education requires a significant integration of learners’ cognitive, affective, and behavioral development within practical teaching paradigms. However, a comprehensive understanding of the underlying psychological evolution mechanisms in such long-term, complex skill acquisition remains a critical gap. Traditional handicraft apprenticeship models, historically instrumental in cultivating highly skilled artisans, offer a rich, demonstrably effective case study for investigating these mechanisms. This research delves into the learning journey of traditional handicraft artisans, from novice to master, to uncover the core psychological dynamics underpinning their skill refinement, with a specific focus on the sources and development of self-efficacy. Utilizing a grounded theory approach, semi-structured retrospective interviews were conducted with 10 senior artisans. The findings have led to the construction of a three-phase model encompassing nine key themes related to the sources of self-efficacy. These findings reveal significant phase-specific differences in how artisans’ self-efficacy evolves along their skill development path. Foundational Mastery Phase: Building the Bedrock of Confidence In the initial foundational mastery phase, self-efficacy primarily stems from a combination of affective states, vicarious experiences, and mastery experiences. This period is characterized by the artisan’s nascent engagement with the craft, where their belief in their own capabilities is shaped by their emotional connection to the work, their observations of others, and their initial successes. Affective states, such as genuine interest and a sense of responsibility, provide the intrinsic motivation to persist through early challenges. For example, an artisan might find joy in the repetitive nature of a task, reframing it as exploration rather than monotony. Familial duties or organizational assignments can also be internalized as a profound sense of purpose, transforming external expectations into a stable internal drive. This is often reinforced by educational discipline, where early encouragement and instruction from elders or mentors cultivate habits of independence and self-reliance, contributing to a resilient emotional foundation. Vicarious experiences, such as observing master craftspeople or following step-by-step demonstrations, are crucial. However, their impact is contingent on the learner’s cognitive appraisal. Clarity, replicability, and relevance are key. An artisan gains confidence not just by watching, but by understanding that the observed methods are applicable to their own situation. Guidance from others, whether a timely suggestion or a detailed demonstration, can significantly bolster belief in one’s ability to overcome obstacles. Mastery experiences, accrued through sustained practice and initial successes, solidify the belief that learning is achievable. Even small accomplishments, like mastering a basic technique or completing a simple component, contribute to a growing sense of control and capability. This initial accumulation of successful experiences is the bedrock upon which further development is built. Proficiency and Application Phase: External Validation and Deepened Understanding As artisans move into the proficiency and application phase, the core sources of their self-efficacy shift. External support, vicarious experience, and affective states become the dominant influences. This phase is marked by a transition from foundational learning to independent application and refinement. External support emerges as a critical factor. This includes recognition through competitions, exhibitions, and awards, which serve as objective validation of professional competence. The positive feedback, recommendations from organizations, and acknowledgment from masters and consumers all contribute to a strengthened belief in one’s abilities. For instance, participation in juried craft shows and receiving favorable reviews can significantly boost an artisan’s confidence, validating their skills in the marketplace. Furthermore, policy emphasis from cultural heritage bodies or government initiatives can provide tangible encouragement and resources, underscoring the value of their craft and reinforcing their commitment. Material support from families or institutions also plays a crucial role, enabling sustained investment in their practice. Vicarious learning in this phase becomes more sophisticated. Artisans engage in comparative imitation, deconstructing and analyzing the work of peers, historical artifacts, or client samples to identify areas for improvement. Proactively seeking help from masters or fellow artisans, both in person and through online platforms, becomes a key strategy for overcoming technical impasses. This proactive engagement with external knowledge sources allows them to integrate successful strategies into their own practice. Affective states, while still important, evolve. Artisans begin to internalize professional standards, driven by a pursuit of perfectionism. This is often a blend of external scrutiny from rigorous inspection processes and an internalized personal standard of excellence. The phrase "what matters more is the standard within oneself" captures this internal drive. While Bandura’s concept of "physiological states" was less salient in this phase, the emotional regulation derived from meeting high personal and professional standards is paramount. Breakthrough and Innovation Phase: Self-Regulation and Creative Autonomy In the breakthrough and innovation phase, the emphasis shifts significantly to self-regulation, alongside physiological and affective states, and continued mastery experience. This stage represents the transition from skilled executor to creative innovator. Self-regulation becomes the paramount source of self-efficacy. It is not merely about having resources, but about an artisan’s autonomous control over the creative process. This includes sophisticated management and coordination of all aspects of production, from task delegation and material sourcing to client communication and financial viability. Resource investment—time, energy, and capital—demonstrates a deep commitment and belief in their innovative endeavors. Artisans actively engage in broad learning, integrating knowledge from diverse fields such as art history, material science, and technology to inform their creative direction. Technological empowerment, by integrating new tools and techniques, expands their creative possibilities. Meticulous observation of the world, drawing inspiration from nature and daily life, becomes a fundamental aspect of their creative thinking. This high degree of cognitive autonomy and decision-making authority fosters a profound belief in their ability to shape the future of their craft. Physiological and affective states remain vital, manifesting as deep immersion, courage, conviction, and a desire for recognition. Artisans may enter a state of near-obsession, where their work becomes an integral part of their life rhythm, fueling persistent effort through complex creative processes. This is often intertwined with a profound sense of cultural reverence or familial legacy, imbuing their work with historical significance. They possess the courage to challenge conventions and forge new paths, driven by a steadfast conviction and diligent temperament. The desire for industry recognition and social appreciation further fuels their resilience. Simultaneously, a nuanced awareness of their own physical capabilities becomes important, influencing their creative choices and leading to an acceptance of the relationship between physical capital and peak creative periods. Mastery experience, though evolving, continues to be crucial, primarily through repeated trial and error in uncharted territory. The confidence derived here is not from flawless success, but from the interpretation of failure as a learning opportunity. The ability to extract lessons from setbacks and to systematically identify causes for errors reinforces the belief in one’s capacity for continuous self-improvement and innovation. Implications for STEM Education and Program Design The insights gleaned from the study of traditional handicraft artisans offer significant implications for contemporary STEM education and other practical training programs focused on cultivating innovation. The model developed suggests a phased approach to program design, aligning interventions with the evolving psychological needs of learners. For the foundational mastery phase, programs should focus on creating a guidance-oriented exploratory environment. This involves providing clear step-by-step demonstrations, modular tasks, and immediate positive feedback to foster initial confidence and successful experiences. This approach helps learners overcome initial anxiety and build a solid base of belief in their learning capacity. In the proficiency and application phase, the focus should shift to building an application platform that connects diverse resources. This includes integrating mentors, peers, clients, and industry professionals. Providing opportunities for real-world projects, industry feedback, and collaborative exchanges helps artisans validate their skills and consolidate their capabilities through external recognition and practical challenges. This phase transitions confidence from knowing how to execute tasks to being capable of effective application. For the innovation phase, the emphasis must be on constructing a meaning-making community with a high degree of autonomy. This involves empowering artisans with decision-making authority, resource allocation power, and deep academic and cultural endorsement for their innovative explorations. This approach supports the translation of internal creative impulses into socially and culturally valuable outcomes, fostering a shift from technical executor to conceptual creator. Broader Impact and Future Directions This research provides a psychological blueprint for designing phased skill cultivation programs, deepening our understanding of Bandura’s self-efficacy theory within the unique context of long-term skill acquisition. The study highlights that fostering exceptional talent requires not only the progressive advancement of knowledge and skills but also a meticulously designed psychological support system that evolves in synchrony, promoting the synergistic development of cognition, emotion, and behavior. While the study achieved theoretical saturation with 10 participants, further research with larger and more diverse samples across various handicraft categories is recommended. Future studies could also benefit from combining retrospective interviews with participatory observation and unstructured interviews to gain a more comprehensive understanding of self-efficacy sources. Employing methods that allow participants to rank the importance of identified sources could also provide valuable insights. Furthermore, acknowledging the potential for memory reconstruction and current status to influence retrospective accounts, future research could explore longitudinal studies to capture the dynamic evolution of self-efficacy in real-time. The findings offer a valuable perspective for modern STEM education, which increasingly emphasizes inquiry-based learning and practical application. By understanding how traditional apprenticeship models foster robust self-efficacy, educators can develop more effective strategies to cultivate confident, innovative, and resilient learners prepared to tackle complex challenges in the 21st century. 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