This study aimed to 1) investigate the states and problems in doing classroom research, 2) explore the needs of the teachers' potentiality in doing classroom research, 3) finding out guidelines of developing the teachers' competence in doing classroom research, and 4) monitor effects of the teachers' competency development in conducting classroom research in Ban Un Dong School under the Office of Sakon Nakhon Primary Educational Service Area 2. The samples consisted of the researcher and 17 co-researchers in the academic year 2013. The 4-stage action research with planning, action, observation and reflection was employed. Instruments applied included a questionnaire, a form of observation, a form of structured- interview, a form of internal supervision as well as a form of performance check. Mean, percentage and standard deviation were utilized.

Findings were as follows:

1. The states and problems on doing classroom research at Ban Un Dong School were:

1.1 The states of doing classroom research revealed that most teachers also report to the classroom research is not official. Do not understand the process of writing a research report in class. And there is no published research extensively.

1.2 The problems in doing classroom research indicated that most of the teachers encountered a lack of knowledge. understanding and skills in doing classroom research.

2. The needs on the teachers' competence development in doing classroom research of Ban Un Dong School showed that the teachers wanted to attend a development training of doing classroom research to solve the problems systematically as well as to be regarded as their academic works for the promotion to a higher rank.

3. The guidelines of the teachers' potentiality development in doing classroom research included the 2 following means : a workshop and internal supervision.

4. The effects of the teachers competency development in conducting classroom research revealed that the co-researchers gained a better knowledge and understanding  in doing  classroom research, after the training session, at the highest level than those before the training. In addition, from the check of classroom research done, it was found that the teachers could write the reports on the doing of classroom research formally.