Also, contact the practice in Vietnam, the authors adjusted the variables suitable to the particular circumstances of the public service sector and construction SI preliminary scale. Then, the author has used technical depth interviews with 35 people who use this service to find out whether the respondents have understood correctly the variables in the scale, the components of the scale is appropriate and has incurred more other components. After qualitative research, the authors build a preliminary survey and use this survey to try 35 people surveyed use the service to continue to calibrate scales
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