This paper reports the progress of one efforts to develop desirable criteria for quality early childhood programs. The purpose of this study was to examine reliability, concurrent validity, and items analysis of the Assessment Profile for Early Childhood Programs (APECP) and closely instrumental character of it. The 421criteria used in this study were based on the items of APECP. The APECP developed by Martha Abbott-Shim & Annette Sibley was designed to maintain high quality program by teachers and administrators. The criteria used to measure the quality of children`s experiences in program and to be used in guiding program development by the Quality Assisst, Inc. The APECP is a guide an indepth self-evaluation and includes directions for using the profile, structured obsdervation check lists, scoring sheets, and profile graphs. The APECP is orgarnized into the following components : administration, infant, preschool and school-age(except this part from the study). Qusestionnaires that constructed 421 criteria (the traslated version of APECP) were administered to 25 supervisors who were in charge of early childhood education and 44 college professors who were in the department of early childhood education and child development. Each criterion was rated on a 5-point scale The classroom observations were administered to each of the classrooms by both 3 observers who had full traning about APECP-research version (87items), Early Childhood Environment Rationg Scale, and Accreditation Criteria for early childhood center. One observer could collect data for 3 classroom in one program day by rotation cycle. Data also were collected in 10 early childhood education institutions. Criteria are treated as dictomous variables and are scored either "Yes" observed or "No" not observed or not observed to occur consistently. The analysis will base on the data obtained from questionnaires of supervisors and professors, and the rating of observers. The major findings were as follows : Form the result of items analysis, it was found the criteria was almost appropriate Form the result of items analysis, it was found the criteria was almost appropriate by early childhood professionals. The range of mean score was 3.80-4.76. The present research showed the coefficient of inter-observer reliability, the total score of the APECP-research version was .83 - .91. The concurrent validity of the APECP and Early Childhood Environment Rating Scale and Accreditation criteria was .9315(p<.001) and .5252(p<.01) which is considered to be pretty high.