An Integrated Curriculum Development for Prathomsuksa V: a case study of Tasaban Watdon Kai Dee school. The study were totally 35 participants. They were the students in prathomsuksa V academic year 2013 of Tasaban Watdon Kai Dee school Krathumbaen Municipality Samutsakhon Province. The classes were taught in the present so it is easy to experiment and collect data from the effects of the use of an integrated curriculum.