ABSTRACT
There can be little doubt that the construction is the most hazardous in-dustry in the worldwide. This study was designed to modeling the factors affecting un-safe behavior from the perspective of safety supervisors. The qualitative research was conducted to extract a conceptual model. A structural model was then developed based on a questionnaire survey [n=266] by two stage Structural Equation Model [SEM] approach. An excellent confirmed 12-factors structure explained about 62% of variances unsafe behavior in the construction industry. A good fit structural model indicated that safety climate factors were positively correlated with safety individual factors [P<0.001] and workplace safety condition [P<0.001]. The workplace safety condition was found to play a strong mediating role in linking the safety climate and construction workers' en-gagement in safe or unsafe behavior. In order to improve construction safety performance, more focus on the workplace condition is required.
ABSTRACT
With rapid economic development and industrialization, the construction industry continues to rank among the most hazardous industries in the world. Therefore, construction safety is always a significant concern for both practitioners and researchers. The objective of this study was to create a structural modeling of components that influence the safety performance in construction projects. We followed a two-stage Structural Equation Model based on a questionnaire study [n=230]. In the first stage, we applied the Structural Equation Model to the proposed model to test the validity of the observed variables of each latent variable. In the next stage, we modified the proposed model. The LISREL 8.8 software was used to conduct the analysis of the structural model. A good-fit structural model [Goodness of Fit Index=0.92; Root Mean Square Residual=0.04; Root Mean Square Error of Approximation=0.04; Comparative Fit Index=0.98; Normalized Fit Index=0.96] indicated that social and organizational constructs influence safety performance via the general component of the safety climate. The new structural model can be used to provide better understanding of the links between safety performance indicators and contributing components, and make stronger recommendations for effective intervention in construction projects
ABSTRACT
Cognitive-based human errors have major contribution to performance and safety in working environment. This study designed to develop a measurement tool in order to evaluate this type of errors in the occupational settings. An Occupational Cognitive Failure Questionnaire [OCFQ] was developed. Content validity of the OCFQ was performed using a quantitative approach. Reliability of questionnaire was assessed by internal consistency and test-retest methods. A preliminary list of 35-items was prepared as a starting point. After evaluation of validity, five items were rejected. The new measurement instrument with 30-items was finally developed. The content validity index [CVI] for the final OCFQ was found acceptable [CVI=0.7]. Results show that final OCFQ was internally consistent [alpha=96] and intraclass correlation coefficients [ICC] was 0.99. Measurement of cognitive failure in the workplace requires a valid and reliable tool. In respect to probable outcomes of cognitive failures occurrence at work, the present study suggested that OCFQ would be a useful instrument for measurement of cognitive failure in the working environment