The Effect of Project-Based Learning (PJBL) Ussing Pizzaluv- Mathemarics Media on Self-Efficacy and 4C Skills

In the era of modern education, effective instruments to measure 4Cs and students' self-efficacy are urgently needed. This study aims to (1) compare the mathematics skills of students taught using the PjBL model with Pizzaluv-Mathematics media and students taught using the PBL model; (2) measure the effect of PjBL on students' self-efficacy; and (3) evaluate the impact of PjBL on 4Cs. This study was conducted on twelfth-grade students at MAN 2 Malang, Indonesia, in the context of algebraic function limits. Pizzaluv-Mathematics media is designed to help students complete learning projects through communication, collaboration, and critical and creative thinking in making a "Love" shaped math pizza using visual media. This study used a quasi-experimental design involving 72 students divided into an experimental group (PjBL) and a control group (PBL) based on pre-existing class divisions. Data were collected using tests and questionnaires to measure self-efficacy and 4C abilities. Self-efficacy was assessed using a standard scale with proven validity and reliability, while 4C skills were measured through performance tasks and peer evaluations with strict objectivity standards. Two-way analysis of Variance (ANOVA) showed a significant difference in mathematics learning ability that favored the PjBL model using Pizzaluv-Mathematics media (p < 0.05, η² = 0.11). The results of one-way ANOVA also showed significant differences in 4C ability and self-efficacy between student groups (p < 0.01). In addition, Pearson correlation analysis revealed a strong positive relationship between 4C ability and selfefficacy (p < 0.01). The findings of this study indicate that the PjBL model using Pizzaluv-Mathematics media positively impacts students' self-efficacy and 4C ability.