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The relationship between personal mastery and organizational improving quality and productivity
Yadollah Hamidi, Zahra Toosi, Dr Leili Tapak,
Volume 6, Issue 1 (Journal of Ergonomics 2018)
Abstract
Background: Human resources and their potential and capabilities, will play an important role in promoting quality and productivity, Which has been discussed in the macrovascular discussions with the aim of enhancing the organization's performance. The aim of this study was to investigate the relationship between Personal Mastery and the consequences of quality improvement and productivity in Hamadan University of medical sciences.
Methods: This is a descriptive/ analytical study. 295 managers and experts of university staffs were selected through random sampling. Data were collected by two questionnaires: "Peter Senge Learning Organization" and "Resourceful Total Quality Management" questionnaires. Data were analyzed by descriptive statistics, t-test and ANOVA at 95% confidence level, Pearson correlation coefficient and regression analysis using Spss16 software.
Results: The results showed a mean of Personal Mastery of 23.1 and a positive and significant correlation between Personal Mastery and the consequences of improving quality and  productivity (p<0.001). Also, there was a significant difference in Personal Mastery in both sexes (p<0.005). But this difference was not evident in terms of degree and field of study.
Conclusion: Productivity in the service sector depends, rather than depends on technology and other factors, on human resources and factors affecting it. Therefore, attention to capabilities and empowerment of human resources is very important and can be achieved through a macrovagnomic approach and development of infrastructure related to the empowerment of employees in the organization, to increase efficiency, productivity and quality improvement.

Psychometrics of an Occupational Cognitive Failures Questionnaire for Heavy Machinery Operators in Road and Urban Construction: A Study of Validity and Reliability
Moein Darestani, Leili Tapak, Mostafa Mirzaie Aliabadi, Neda Mahdavi,
Volume 11, Issue 3 (Iranian Journal of Ergonomics 2023)
Abstract
Objectives: Today we are witnessing tremendous growth in construction and the use of heavy machinery. As a significant portion of human errors is attributed to cognitive failures, there is a need for robust tools to assess these cognitive failures. Therefore, the primary goal of this study was to investigate the psychometrics of the current Occupational Cognitive Failures Questionnaire for Heavy Machinery Operators in Road and Urban Construction.
Methods: A total of 84 drivers of road and urban construction machinery were selected by simple random sampling method. Initially, job-related items for these people were selected for inclusion in the questionnaire, irrelevant items were removed, and proposed items were added. To assess structural validity, the tool was administered to 10 experts. Then, content validity ratios (CVR) and content validity indices (CVI) were determined for each of the items and evaluated using confirmatory factor analysis conducted in AMOS software (version 23). Cronbach's alpha coefficient was used to measure reliability. Data were analyzed in SPSS software (version 20).
Results: The final questionnaire comprised 16 items, with CVR and CVI leading to their inclusion in the final structure. The CVR of the questionnaire was 0.90. Additionally, the indices of the fitted model included CMIN/DF, TLI, CFI, IFI, GFI, AGFI, and RMSE, which were obtained at 1.16, 0.851, 0.88, 0.898, 0.86, 0.802, and 0.044, respectively. The Cronbach's alpha coefficient was calculated at 0.633.
Conclusion: The psychometrics of the Cognitive Failures Questionnaire demonstrated suitable validity and reliability for heavy machinery operators in road and urban construction. It can be effectively used for ergonomic evaluations.

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