Estimating of Personnel's Variable Productivity Rate Using Fuzzy Sets Theory in Linear-Repetitive Projects and investigating its effect on the Schedule

Linear-repetitive projects are in which one or more group of activities repeat in different parts of project. Because of their special nature and importance of factors such as resource work continuity, personnel’s variable productivity rate and effect of learning curve on efficiency of human resources, these projects scheduling is very particular and traditional methods cannot achieve optimum results herein. Personnel’s learning phenomenon has been underline in past researches but they have less set to this matter. In present study, an approach for modeling learning rate and considering it in line of balance technique was processed. For this end, fuzzy sets theory has been apply here. After calculating the learning rate, it has been use for estimating amount of required worker-hours, variable productivity rate of labor and expected duration of activities in each unit of project. Based on outputs, it was obvious that effect of learning due to repetition results in reduction of total project duration and scrounging in its total cost.