Developing Decision-Making Competence in Primary School Students: Effects of an Inquiry-, Problem-Solving-, and Role-Play-Based Educational Intervention

Contemporary education increasingly emphasises transferable competencies that enable learners to analyse situations, evaluate information, and make responsible decisions. This study examined the effects of a structured educational intervention based on inquiry, problem-solving, and role-play activities on the development of decision-making competence in primary school students. A quasi-experimental pre-test–post-test design with a control group was employed. The initial sample consisted of 64 second-grade students, with final analyses conducted on 39 complete cases. Decision-making competence was assessed using a researcher-developed multidimensional scale encompassing six dimensions: identification of alternatives, justification of decisions, anticipation of consequences, autonomy, collaboration, and responsibility. The results indicated a significant improvement in decision-making competence from pre-test (M = 13.23, SD = 1.68) to post-test (M = 20.05, SD = 4.49), t(38) = 8.45, p < 0.001, d = 1.35. Additionally, analysis of covariance revealed a significant effect of group on post-test scores, F(1, 36) = 9.82, p = 0.003, ηp2 = 0.21, with the experimental group demonstrating greater improvement than the control group. A 2 × 2 repeated-measures ANOVA further indicated that gains were more pronounced in the cognitive domain than in the socio-emotional domain. These findings suggest that structured classroom activities involving inquiry, problem-solving, and role-play can support primary school students’ ability to analyse situations, generate alternatives, and justify decisions, particularly within the cognitive dimensions of decision-making competence. At the same time, the more moderate gains observed in collaboration and responsibility highlight the need for sustained, interaction-based learning contexts to support the development of socio-emotional dimensions.