multi criteria decision making methods

The recognition of a system failure causes and their related factors are considered as the most important factor in preventing accident occurrence in different organizations including industries. Human error is a known important factor in unpredictable events of which cognitive factors are the most influential ones. The purpose of this study was to introduce a new model for individual cognitive factors influencing human error as well as determining the interactions between the factors and their intensity using DEMATEL approach. First a qualitative study was performed in order to identify and elicit the individual cognitive factors influencing human error among the workers of different industries. To ensure the adequacy and comprehensiveness of the elicited factors, then, the experts’ opinion was applied. DEMATEL method was used for understanding the interactions among the individual cognitive factors influencing human error. Finally, using these relationships, a new model of the study was proposed. Calculating D-R and D+R relating to the factors in terms of being cause or effect factor, D-R was -1.213 for C5 as the highest negative value, and D+R was 2.294 for the same factor (C5). Also, threshold level was calculated as 0.087 in the current study In this study, the factors of failure in problem solving and decision making (C5) and difficulty in predicting possible hazards in the workplace are effects and the other factors were the cause factors. The factor of C5 was the highest interactive factor.

Performance evaluation and the determination of the effectiveness of a management system, including the HSE management system, is inevitable to achieve continuous improvement in organizations.
Method and Materials: This research was conducted in order to evaluate and rank contractors for HSE performance using (AHP and TOPSIS) in the complex of Imam Khomeini port and Provision of management solutions to improve the HSE status of contractors in this complex.
For this purpose, after identifying 38 contractors, 4 criteria and 22 sub-criteria was determined by using Delphi technique then the criteria and sub criteria were weighed and prioritized by using the AHP method. The management criteria with weight 0.586 obtained the highest score and environmental criteria with weight 0.0085 obtained the lowest score. Also the sub criteria of the HSE professional staff with weight 0.272 obtained the highest and green space with weight 0.006 obtained the Lowest weight. Finally the Assessment and ranking of contractors were done in terms of HSE performance using the TOPSIS technique. The results showed that in terms of HSE performance T.GH.KH company with points 0.9452 ranked the first, A.N.A company with points 0.9367 ranked the second and G.A company with points 0.9264 ranked in the third place. Also, contractors based on performance HSE were ranked in three levels of good (9 contractors), moderate (22 contractors) and weak (7 contractors).
According to the selected criteria, the performance of HSE management in the majority of contracting companies in a favorable situation and a number of companies was at a good and acceptable level. This desirable situation can be attributed to the establishment of HSE management system and the level of contractor's compliance with the HSE requirements.

Medical facilities management can have a significant impact on reducing costs and increase the quality of services. Therefore, it is essential that the selection of equipment in an objective manner that they will be classified according to their importance, so the aim of this article is to choose the most appropriate of supplier based on multi-criteria decision-making methods.
This study was a mixed method. To collect the data, we used documents and interview. The participants consist of top managers, users and experts in medical devices that are in hospital. We used the snowball sampling.
It can be seen that as the method (ELECTERE1), the priority order is D>C>A=B And the method( TOPSIS) is the same, the priority order is D>B>A>C And at in the last way (VIKOR) is A>B>D>C And as we see in the first and second methods most cases are the same except B and C. in the third technique A changed place and become the first rank and, B and C has the same rank.
we were observed that prioritize the options in all of the similarities to each other and yet in some cases differ, in short, no option is in all of the same place, and it seems to make a final decision should use several other methods as a way to help and emphasis our results.