Degree Type


Date of Award


Degree Name

Doctor of Philosophy


Industrial Education and Technology

First Advisor

William D. Wolansky


This study was designed to ascertain the perceptions of the plumbing incumbent workers, supervisors, and vocational educators regarding the current effectiveness of the National Occupational Competency Test in theory and practical aspects in Taiwan, Republic of China;The questionnaire method of data collection was used. A questionnaire was designed and structured into three parts that included the National Plumbing Competency Test critical competencies assessment, the perception assessment and personal information. A total of 112 plumbing incumbent workers, 110 supervisors, and 30 vocational educators responded to the questionnaires;Conclusions drawn from the findings were: (1) There was a high Spearman's rank correlation coefficients between incumbent workers, supervisors, and vocational educators concerning agreement on assigned percentages to the importance of the critical competency factors in an entry level position, and moderate agreement with the National Plumbing Competency Test Committee. (2) Significant differences were found between the National Plumbing Competency Test Committee and the survey groups in terms of assigned percentages to importance of the critical competencies related to reading the blueprint and drawing the manufacture's schematic factors, the accuracy of performance factor, appearance of the product factor, and hydrostatic test factor. (3) Comparison of the incumbent workers, supervisors, and vocational educators perceptions of the National Plumbing Competency Test, overall, the test was perceived more positively by vocational educators than by the incumbent workers and supervisors. (4) Significant differences were found among incumbent workers, supervisors, and vocational educators in terms of the perceptions on the plumbing competency test, the plumbing competency test administration, the test scoring and the interpretation of the plumbing competency test, and the plumbing licensure. (5) Demographic variables, educational level and plumbing working experience contribute significantly to perception toward the National Plumbing Competency Test.



Digital Repository @ Iowa State University,

Copyright Owner

Chang-Yen Tsai



Proquest ID


File Format


File Size

201 pages