TY - JOUR N2 - During implementation of construction projects, durations of activities are affected by various factors. Because of this, both during the planning phase of the project as well as the construction phase, managers try to estimate, or predict, the length of any delays that may occur. Such estimates allow for the ability to take appropriate action in terms of planning and management during the execution of construction works. This paper presents the use of the non-deterministic concept for describing the uncertainty of estimating works duration. The concept uses the theory of fuzzy sets. The author describes a method for fuzzy estimations of construction works duration based on the fact that uncertain data is an inherent factor in the conditions of construction projects. An example application of the method is presented. The author shows a fuzzy estimation for the duration of an activity, taking into consideration the distorting influence caused by malfunctioning construction equipment and delivery delays of construction materials. L1 - http://www.czasopisma.pan.pl/Content/84008/mainfile.pdf L2 - http://www.czasopisma.pan.pl/Content/84008 PY - 2015 IS - No 2 EP - 34 KW - construction delays KW - fuzzy sets KW - fuzzy logic KW - fuzzy rules KW - delay factors A1 - Ibadov, N. PB - WARSAW UNIVERSITY OF TECHNOLOGY FACULTY OF CIVIL ENGINEERING and COMMITTEE FOR CIVIL ENGINEERING POLISH ACADEMY OF SCIENCES DA - 30.06.2015 T1 - Fuzzy estimation of activities duration in construction projects SP - 23 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/84008 T2 - Archives of Civil Engineering ER -