![]() For instance in the Function Points method the number of entities and their complexity is calculated. Parametric estimation is based on formal models that take into account various factors affecting time and effort. The drawback of this method is that it is hard to separate expert subjectivity from experience and to identify the factors contributing to the estimation. Hughes (1996) shows that expert estimation can be reasonably accurate. Expert judgment involves using specialists who have experience in estimating activity duration and knowledge of the particular field. In this adjustment lies the difficulty of this low-cost technique. Project managers study the similarities between the two activities and adjust for any features that may result in differences in duration. Estimation by analogy is based on a comparison of the effort and time taken to complete previous similar tasks (Morgenshtern, Raz, & Dvir, 2007). Duration here is defined as the period of time required for completion of an activity, excluding non-working hours.Īctivity duration can be estimated by several methods: analogy, expert judgement, parametric or WBS. An activity is a work package that: (1) makes no sense to break down any further, (2) produces a deliverable which is measurable (3) endures no longer than a single reporting period and (4) has a duration that can be realistically estimated. Work Breakdown Structure (WBS) at the lowest level of detail of work packages. ![]() Activities are the building blocks of a project. ![]() In project management an activity is the smallest unit of work, described by four parameters: resource consumption, logic relationships with other activities in the project, associated cost, and duration. According to PMBOK (2009), an activity is a component of work performed during the course of a project. In this paper we focus on constructing the project schedule and particularly on the estimation of activity duration. ![]() In the lifecycle of a software project, after finishing the requirements-gathering phase and before the development phase, there is a time for planning the project: resources, schedule, budget and risks. ![]()
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