Validity, Reliability and Usability of a Geogebra-Integrated STEM Training Module for the Topic of Functions among form Four Students

A teaching module must undergo rigorous evaluation before it can be widely used. This study aims to determine the validity, reliability and usability of a GeoGebra-integrated STEM Training Module for the topic of Functions among Form Four students. The evaluation was conducted through the second phase of the Sidek Module Development Model (SMDM). Content and construct validity were assessed by five experts using the STEM Courseware Evaluation Form (STEMCEF) through the expert percentage-agreement method. Usability was evaluated through a pilot study involving 10 students using a usability questionnaire, while reliability was determined using Cronbach’s Alpha coefficient based on 15 valid student data sets. The findings show that the module has a high overall validity of 90.0%, with construct validity reaching 100%. For usability, all items in the Format and Content constructs recorded means above 3.00 with a high level of agreement. The Cronbach’s Alpha coefficient obtained was .874, indicating good reliability as it exceeds 0.80. All reliability items recorded means above 3.00 and were accepted. These findings confirm that the developed STEM Training Module has good quality in terms of validity, reliability and usability, and is suitable as a supporting resource for the teaching and learning of the topic of Functions at the secondary school level.