Fuzzy Inference Model to Estimate the Impact of Changes orders on Construction Duration in Syria

The aim of this study is to develop a fuzzy inference model to estimate the impact of change orders on the duration of construction projects in Syria. This can help in obtaining the optimal estimation of the increasing of the project duration caused by the changes. The capability of gradient estimation of the fuzzy logic approach reduces the distrust of estimation using factor assessment. Also it estimates the duration of the project after any change.via the experts evaluation or according to the crisp logic.