Abstract
Successful implementation of the Critical Path Method requires availability of clearly defined duration for each activity, while the PERT method is based on personal estimation. However, due to the long duration of the construction and unpredicted delays that accompany this process, it is often difficult or almost impossible to predict exact duration of an activity, and consequently to take it for granted that the given activity will be finished on the very same day that is given in the dynamic plan of construction. The aim of presented research was to establish methodology for developing new productivity norms for construction works for planing under uncertainty.
Highlights
INTRODUCTIONProductivity norm can be defined as time required by a skilled worker qualified for a given type of work to successfully complete specific procedure and/or sequence of work operations with satisfactory quality using appropriate tools and/or machines, in average surrounding and ambient conditions, with normal effort and fatigue
In construction industry, productivity norm can be defined as time required by a skilled worker qualified for a given type of work to successfully complete specific procedure and/or sequence of work operations with satisfactory quality using appropriate tools and/or machines, in average surrounding and ambient conditions, with normal effort and fatigue.Standard productivity norms, which have been used for decades in civil engineering for calculating and planning duration of the construction works, can be basically described as deterministic, because they are always precisely and strictly defined by an exact number
This paper presents methodology for developing database of norms applicable for the PERT method, in which each activity is described by its three characteristic times, namely: optimistic, most likely and pessimistic time
Summary
Productivity norm can be defined as time required by a skilled worker qualified for a given type of work to successfully complete specific procedure and/or sequence of work operations with satisfactory quality using appropriate tools and/or machines, in average surrounding and ambient conditions, with normal effort and fatigue. [4] have proven that productivity rates can significantly wary from country to country All these factors can lead to an unreliable dynamic plan for a given construction project. The aim of presented study was to introduce probabilistic approach in planning by creating productivity norms that provide average or most likely time, and optimistic and pessimistic time for each activity, based not on individual estimation but on realistic data obtained by the field research and illustrated by the example of times needed for laying ceramic floor and wall tiles
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