Az’zahra, R.N.A. et al. 2025. Validation of an Assessment Instrument for Collaboration and Critical Thinking in Physics Co-Curricular Activities Integrating Local Wisdom. PPSDP International Journal of Education. 4, 2 (Dec. 2025), 690–708. DOI:https://doi.org/10.59175/pijed.v4i2.801.