1.1 to study and collect information by
-Learn from the secondary level and the floor. By carefully selected related documents, such as documents, reports magazine Ranat instrumental research and seek information from the relevant online media, etc.
-Interviews of experts in practical skills ranat ek The number of 6 persons by selection of a specific (Purposive Sampling) from the roster of experts of special instrumental that appears in document Ranat research project to develop a new musical branch of knowledge by the Board of teacher development and maturation, and from the selection of Professor Chai battle grow gracefully specialist ranat ek has been accepted in the Thai music industry. You must qualify according to the criteria. At least one of the following: