Abstract:
The objectives of this research were to study and compare The internal quality assurance Performance of school under Pathumthani Primary Educational Service Office Area 2, Classified by school size. The samples consisted of 227. educational administrators and teachers. The instruments used to collect was a set of five - point rating scale questionnaires with a reliability of 0.96 . The statistics used for analyzed were Percentages, mean arithmetic means, standard deviation, and One-Way ANOVA. When difference was found, Scheffes test of comparison was used.The findings were as follows:1. The performance of The Internal Quality Assurance Performance of School under Pathumthani Primary Educational Service Office Area 2 as a whole and in each aspect, was at a high level. The Performance of management according to school development plan has the highest mean and the management and information Technology has The lowest mean.2. The comparison of the internal quality assurance Performance of school under Pathumthani Primary Educational Service Office Area 2, indicated statistically significant difference or the level of .05