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A rational analysis of an internal quality assessment result is crucial to the suc cess of the quality management.Normally there are variations associated with the quality assessment such as the expertise in question formulation, data collection and sampling technique used as well as what and how many well-documented evidences are available to an auditor during the assessment period.For all Rajabhat univer sities, an internal quality assessment result for each item audited will be classified according to an ordinal scale of 1 to 5; worst to best.The audit result is usually not deterministic but instead probabilistic in nature.For instance, an audit result of teaching performance of a faculty shows that the performance falls into all 5 cat cgorics with different proportions.Modeling quality asscssment outcomes must take uncertainty and intrinsic variation into consideration in which results of audit are modeled as multinomial outcomes.The research methodology starts with collecting available internal quality assessment reports of all Rajabhat universities in Thailand for differences in the basic information of assessment structure, procedure as well as results.Next the statistical model was used to model the internal quality as sessment results and a mechanism for determining the final assessment results was constructed using a test desigued to determine the decision making model for audi tor.A cross-classified experiment was conducted as follows.Stratified sampling was used to select Rajabhat universities across Thailand.For each sample unit, internal quality assessment teams are selected randomly and given test questions.Two weeks later the same subject was given the same test in order to validate the existing notion of intrinsic and inconsistency variation of auditor.The ordered logit model was used to model the uncertainty and variation in decision making.The model was tested for efficiency using validating data.A reasonable modeling with ease of use was chosen.This research finding will help top managements at Rajabhat universities in determining and looking at assessment results the right and more sensible way.Additionally, the results can be applied to other Thais universities in analyzing the internal quality assessment outcomes.