Open AccessEstimation Of Task Completion Times With The Use Of The PERT Method On The Example Of A Real Construction Project
Author(s) -
Edyta Plebankiewicz,
Michał Juszczyk,
Jarosław Malara
Publication year - 2015
Publication title -
archives of civil engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.208
H-Index - 15
eISSN - 2300-3103
pISSN - 1230-2945
DOI - 10.1515/ace-2015-0024
Subject(s) - task (project management) , duration (music) , randomness , reliability (semiconductor) , estimation , computer science , function (biology) , focus (optics) , component (thermodynamics) , operations research , reliability engineering , industrial engineering , statistics , mathematics , engineering , systems engineering , art , power (physics) , physics , literature , optics , quantum mechanics , evolutionary biology , biology , thermodynamics
The article presents briefly several methods of working time estimation. However, three methods of task duration assessment have been selected to investigate working time in a real construction project using the data collected from observing workers laying terrazzo flooring in staircases. The first estimation has been done by calculating a normal and a triangular function. The next method, which is the focus of greatest attention here, is PERT. The article presents a way to standardize the results and the procedure algorithm allowing determination of the characteristic values for the method. Times to perform every singular component sub-task as well as the whole task have been defined for the collected data with the reliability level of 85%. The completion time of the same works has also been calculated with the use of the KNR. The obtained result is much higher than the actual time needed for execution of the task calculated with the use of the previous method. The authors argue that PERT is the best method of all three, because it takes into account the randomness of the entire task duration and it can be based on the actual execution time known from research.