The lessons were designed and developed using multimedia such as characters, texts and graphics to motivate the students’ interest. Finally, the students took pretest and posttest and this CAI was evaluated by three experts in the field. The recommendations from the experts were used to revise the lesson regarding contents and multimedia. Fourth, CAI was used by a sample group consisting of 30 students in Thanyaburi Prison. After that, the students and teacher evaluated the lessons from CAI. Finally, the data were analyzed to determine learning achievements from pretest and posttest.