During the construction phase one important factor that facilitates project cost monitoring and control is the selection of the appropriate construction material suppliers. Material vendors' performance could significantly affect the project's outcome especially its final cost and schedule. This paper aims at providing a standardized approach in selecting the best supplier through the formation and use of an appropriate mathematical equation based on multiple criteria. The creation of the function is based on a prototype questionnaire survey. The participants were presented with a predefined set of criteria and were asked to rank them according to their significance. Various statistical methods and techniques were applied to the collected data that produced a number of justified results. Comparison and synthesis of the various outcomes led to the creation of the optimal function for the best supplier selection problem.

No abstract

No abstract

No abstract

This research focuses on the evaluation of a factor analysis of engineers’ perceptions of the performance of highway projects contract types’ (CTs’) against their respective selection criteria (SC) based on the results of a questionnaire survey. The SPSS database’s sample consisted of 91 engineers from Greece and abroad. Patterns of changes in engineers’ assessment of the CTs’ performance were noted and justified by comparing the factors’ content. Apart from the total sample, the analysis considered participants’ subgroups, such as Greek and foreign engineers, and experienced engineers in the private and public sector. Nationality and experience of participants influence the factors’ content. Moreover, a number of criteria tend to cluster together irrespective of CT and engineers’ profile. These pairs of criteria include all uncertainties’ criteria, Scope and Process Uncertainty, Contractual Difficulties and Claims, and finally Value for Money and Criticality of Schedule.