This action research’s objectives were: 1) develop teachers of Umchan Non Ngio School, Prathai District, Nakhon Ratchasima Province, to have knowledge and understanding and be able to organize learning activities to solve problems in the classroom using PLC processes. 2) Develop teaching efficiency of teachers in organizing learning activities to develop learners to their full potential and to have desirable characteristics according to the course. A group of 4 study participants consisted of 1 researcher (a Science teacher), a Thai language teacher, a Mathematics teacher, and an English teacher. Additional information group of 16 people consisted of: an expert, a director, 2 deputy directors for Academic Affairs and 13 teachers from Umchan Non Ngio School, Prathai District, Nakhon Ratchasima Province. There were 3 development strategies: workshop, supervisory supervision and clinical supervision. The tools used for data collection were 3 types of tools: a test, a structured interview and a participant observation. The statistics used for data analysis were mean, x, and percentage. The study results were presented by descriptive method. The results of the study were revealed that Cycle 1 was the development of personnel in learning management in the 21st century, as PLC (Professional Learning Community) by workshops from pre-workshop testing activities, education activities by lectures, post-workshop testing, and PLC activity trainings. The results of the 3 study participants were as follows: knowledge test and understanding results before the workshop, which was an average score of 16.66 or 55.53 percent, and after the workshop, was an average score was of 25.33 or 84.44%. Supervisory activities were performed by observing the teacher samples’ PLC management behaviors and assessed by the PLC activities organized by 3 people sample group through the workshop. They were leaders who organized activities and they could organize PLC activities for the school teachers. Members of the PLC group were encouraged to brainstorm the teaching and learning problems. There was an exchange of opinions and of learning how to solve problems for students. It was summarized that the human resource development in organizing learning activities in the 21st century using the Professional Learning Community (PLC) processes at Wat Umchan Non Ngio School. The organization of workshops and supervisory practices has resulted in a change in the management of better teaching and learning. As it was suitable for the learners’ problems, all participants of the study could organize PLC activities so that learners could learn to their full potential and make their learning management more efficient.