This document presents a study on developing computer-assisted language learning (CALL) as supplementary vocabulary exercises for Matthayomsuksa 1 students at Kaokam Wittaya School in Ubon Ratchathani, Thailand. The study aims to examine students' vocabulary learning achievement before and after using CALL exercises, and explore students' opinions of the exercises. A pre-experimental research design with a pre-test and post-test will be used. Thirty students will participate in vocabulary lessons supplemented by CALL exercises and complete pre- and post-tests and a questionnaire about their experiences.