The  purposes  of  this  research  were  to  investigate  the  problems  of  internal  quality assurance  performances  in  basic  schools  under  Chonburi  Educational  Service  Area 2, and  to  compare  those  problems  as  classified  by  positions  and  school  sizes. The  samples consisted  of  118  school  administrators  which  were  selected  by  the  mean  of  purposive  random  sampling  and  287  teachers  selected  by  the  mean  of  stratified  and  simple  random  sampling. The  instrument  used  in  this  research  was  a  set  of  5-item  rating  scale  questionnaire.  Percentage, mean, standard  deviation, t-test  and  One  Way  ANOVA  were  employed  for  data analysis. 
	The  findings  of  this  research  were  as  follows : 
	1.  Problems  of  internal  quality  assurance  performances  in  basic  schools  under  the  Office  of  Chonburi  Educational  Service  Area  2  as  a  whole  and  all  aspects  were  at a  low  level, ranking  by  the  mean  scores, there  were  system  education  quality  surveillance, education  quality  assessment, standard  education  development, the  arrangement  due  to  the  plan development  on  education  quality, checking  and  reviewing  education  quality, the  systematization  for  management  and  information, operating  follows  the  plan  development  on  education  quality, and  education  quality  report. 
	2.  When  comparing  problems  of  internal  quality  assurance  performances  in  basic schools  under  the  Office  of  Chonburi  Educational  Service  Area 2  as  classified  by  positions  there  was  not  found  significant  difference.

3.  When  comparing  problems  of  internal  quality  assurance  performances  in  basic schools  under  the  Office  of  Chonburi  Educational  Service  Area  2  as  classified  by  school  sizes, there  was  found  significantly  difference  at .05 level.
