The objectives of this research were: 1) to study coordination on the justice process of justice authority in Nakhon Sawan Province, 2) to study the problems and obstacles of coordination on the justice process of justice authority in Nakhon Sawan Province, and 3) to study the ways for the development of coordination on the justice process of justice authority in Nakhon Sawan Province.

   This research applied the Mixed Methods Research consisting of the qualitative and quantitative research. The sample was 334 personnel of the organizations relating to the justice process in Nakhon Sawan Province by the stratified random sampling. The tools of the research were questionnaire with the 0.813 of reliability and in-Depth interview from the 8 key informants. The analysis of data used Statistical Package for Social Science.  The statistics for analysis data used Frequencies, Percentage, Mean, and Standard Deviation.

   1. Overall, the level of coordination on the justice process of justice authority in Nakhon Sawan Province was at the middle level ( = 3.04). When considering each aspect, it arranged from the high to low level: the law process  ( = 3.05), the commander ( = 3.05), the procedure ( = 3.03), and the personnel ( = 2.94).

2. The problems and obstacles were that the process was sometimes incomplete, did not enforce the law seriously and properly. In the family case, the court did not inform the result of the judge. The court did not inform the litigants to meet the staffs so the court could not seek the case. The law and the regulation of the organization were unsuitable in the working. The process of the judge was complex to the cooperation of the organization in the process of the judge in Nakhon Sawan Province. Sometimes, the cooperation depended on the allowance of the commanders. It made the cooperation complex. The court did not promote the Center for Integration of Law Learning between the organizations of the justice process. The process of the Justice Court should reduce the complex process. The director of the court should permit for the working decentralize the power to the other person. The court did not train in working or cooperation between the organizations relating to the process of the judge. Moreover, the director hardly gave importance in the human relations of the colleagues in the organization relating to the process of the judge.