Ningtyas, A.P. 2026. MEDIATING ROLE OF COLLABORATION COMPETENCE IN PROJECT-BASED LEARNING AND PROBLEM SOLVING. ECOTECHNOPRENEUR : Journal Economics, Technology And Entrepreneur. 5, 2 (Jun. 2026), 202–222. DOI:https://doi.org/10.62668/ecotechnopreneur.v5i2.2804.