Critical factors affecting construction quality in Nigeria: evidence from industry professionals

The overall aim of this study is to improve construction quality in Nigeria through the identification of pertinent factors affecting the process. Relevant factors were identified from the literature and studied by means of questionnaire survey sent to construction industry professionals that include architects, engineers, quantity surveyors and builders. The importance of each factor was computed for all the professionals via the severity and frequency responses of the factors. Data analysis includes ranking comparison among the professionals using severity, frequency and importance indexes. Percentage rank agreement factor (PRAF) was used to measure agreement of the importance ranking among construction professionals and one sample t-test was conducted to determine the significance of each factor. Finally, correlation analysis was used to measure the degree of correlation among all professionals.The results shows that the five most important factors are ‘poor quality of materials delivered to site’, ‘lo...