The purposes of this research were 1) to develop the multimedia learning materials in designing and technology subjects together with 5Es instructional model for grade 8 students, 2) to evaluate the quality of the multimedia learning materials in designing and technology subjects together with 5Es instructional model for grade 8 students, 3) to find the effectiveness of the multimedia learning materials in designing and technology subjects together with 5Es instructional model for grade 8 students, 4) to compare the learning achievement of the students before and after learning with multimedia learning materials in designing and technology subjects together with 5Es instructional model, and 5) to find the satisfaction of students on the multimedia learning materials in designing and technology subjects together with 5Es instructional model. The sample group used in this research was 40 students of grade 8 students at Banraiwitthaya School. The simple random sampling technique was used. The instruments used in this research were the multimedia learning materials, the assessment form of the content, the assessment form of the techniques and methodology, the learning achievement test, and the assessment form of student satisfaction. The data were analyzed using mean, standard deviation, and dependent t–test.

The research findings showed that: 1) the multimedia learning materials that developed was consisted of 3 units including problem-solving situation analysis, technology in environmental management, and problem-solving analysis, 2) the opinion of the content experts on the multimedia learning materials was at the highest level, and the opinion of the technique and methodology experts on the multimedia learning materials was at the highest level, 3) the effectiveness of the multimedia learning materials together with 5Es instructional model was 88.17/80.58, 4) the students who studied with the multimedia learning materials together with 5Es instructional model had post-test scores higher than pre-test scores at .05 significance level, and 5) the students' satisfaction with the multimedia learning materials together with 5Es instructional model was at the highest level.