This institutional research has 4 objectives: (1) to find out the guidelines for developing and improving the tertiary educational administration system relating to the educational reform concept, particularly the co-operative education concept; (2) to compare the semester and trimester systems by their problems and limitations including the solution guidelines with particular relation to the co-operative education; (3) to propose guidelines for system adjustment and impacts that may derive from such system change or adjustment; and (4) to propose the appropriate guidelines for educational administration improvement with relation to the educational reform guidelines of the national education act B.E. 2542.