The document discusses developing English vocabulary for Mattayomsuksa1 (M1) students using computer assisted instruction (CAI). It aims to study the results of using CAI versus a teacher's manual method, and to compare the results. The population is 600 M1 students from Sakonrajwithayanukul School in Sakonnakhon, Thailand. Two classes will be randomly selected, one as the experimental group using CAI and one as the control group using the teacher's manual method. An experimental research design with randomized control group pretest-posttest and t-tests will be used.