Development of Lectora Inspire to Identify Students’ Conception Level on Vector

The COVID-19 pandemic caused direct learning to be restricted. Due the lack of interaction, potential losses, such as mastery concepts, become very large. Therefore, a diagnostic test is carried out so teachers know students' conception. Recently, four-level was assessed effectively reveal conceptions based on their answers, level confidence in answering, giving reason, and choosing reasons. However, implementing constrained directly, media needed accommodate them. purpose develop lectora inspire identify conception vector. ADDIE method used. Quantitatively, validity calculated percentage analyzed using Likert scale. While qualitatively, suggestions for improvement are given by experts followed up. Additionally, group conducted determine efficiency practicality media. Based this research, it known that Lectora Inspire declared valid, effective, practical use.