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The purpose of this paper is to study and prioritize the problems impacted on construction work together migrant laborers, by using the Delphi technique. The case study is construction work in Bangkok and metropolitan zones, Thailand.

The framework of the perceived issues caused by working with migrant construction labors especially migrant construction laborers from neighboring countries were identified from literature reviews. The issue list was sent to 162 experts seeking for their opinions. Subsequently, a questionnaire was created from 58 items of suitable issue lists according to expert's opinions. The questionnaires were then submitted to 147 respondents from construction contractor companies. Their responses were calculated and prioritized by means of the Delphi technique

The polling data showed its constancy on the second round of survey. There were 34 out of 58 items passed consensus criteria. The issue “Foreman obtained incompetent or inadequate trained migrant labors when relocate them from/to other site or job” ranked 1st in priority ranking with the average score of 4.56. Subproblems were appropriately prioritized according to their mean scores.

The results of this research were expected to facilitate construction operators in making appropriate decisions and primary solution concerning main issue factors in working with migrant labors, in order to help even more increasing competition efficiency in Thai construction industries.

The research provides a list of main issue occurred in the case study. These outcomes are also expected to provide important information for other case studies on the issue working with migrant construction labor.