Hagos Hailu, B. 2026. Construct and Predictive Validity of Head-Toes-Knee-Shoulder (HTKS) Test as a Measure of Executive Function of Children in Pre-primary O-Classes in Ethiopia. The Ethiopian Journal of Education. 45, 2 (Jan. 2026), 135–166. DOI:https://doi.org/10.63990/eje.v45i2.13080.