The purposes of this research were: 1) to compare the learning achievement of Diploma Degree students by using PBL and the MIAP method; and 2) to compare the science process skills of these students. The sample group were 2 classrooms of second year diploma degree
students in the second semester of academic year 2016 who were studying in the Industrial Department of Chanthaburi Technical College. The instruments used in this research were: 5 PBL lesson plans, 5 MIAP lesson plans, a learning achievement test and a science process skills test.
The statistics used for this research were: mean, standard deviation, and t-test (Independent).