The objectives of this study were to study the level of attitude, the level of participation of personal in
internal quality assurance, and the level of attitude and to compare of personnel participation in the Veterinary
Medicine of Mahidol University. This study was a survey research. The questionnaires were used for data
collecting which 123 persons in Faculty of Veterinary Medicine of Mahidol University were the sample. 1) the
result of study showed that the four attitude sides about quality assurance were in the middle level at 3.23
by everage and 0.784 was standard deviation (S.D.) 2)The participation level in four sides of quality assurance
were in the middle level at 3.03 by everage and 0.743 was standard deviation (S.D.) 3) The comparision of
diference in four sides of attitude level (attention, comprehension, acceptance and retention) found that the
persons in different department had significant effect on level of attitudes. Moreover, the work period had
significant effects on level of attention. 4) The comparision of difference of participation level in four aspects
were found that the different departments of persons had effect on participation in quality assurance significantly
in aspects of Plan (P), Do (D) and Check (C). In addition, the work periods of persons had effect on participation
in quality assurance significantly in aspects of Do (D), Check (C) and Action (A).