The objectives of this research were to evaluate and compare the evaluation internal quality  assurance project for the basic education schools under the Chachoengsao Educational Service  Area Office 1 of three parts; context, process and outcome by their position and school sizes; i.e. small, medium and large schools.  The research sample totaling were randomly 452 selected school personnel consisted of 118  school administrators and 334 teachers.  The evaluation tool was  five-level rating scales.  The statistics used in analyzing data were percentage, mean, standard deviation, t ? test and ANOVA. (when there is the significant differences. Testing with LSD method.)
The conclusion were composed of :
	1. The evaluation internal quality assurance project for the basic education schools under the Chachoengsao Educational Service Area Office 1 in overall 3 parts on the high level.
2. The preparation results the evaluation internal quality assurance project for the basic education schools under the Chachoengsao Educational Service Area Office 1 classified by position, found that overall and each part in 3 parts have no difference at .05 level and classified by school size revealed significantly difference at .05 level.  After considering as each part was found that have no difference only one part; outcome.  It was found that the practices in medium  and large size school were significantly differences from that in small schools at .05 level.
