This study aims to produce an electronic Student Worksheet (e-LKPD) with Flip PDF Professional based on the Constructivism Approach on Respiration System Materials for Class XI SMA. The research was carried out at the Biology Education Study Program, FKIP UNRI and at the zoom meeting platform for SMA Negeri 1 Pekanbaru students from June to September 2021. This type of research used the ADDIE m…