Step two is important, because it allows for calibration. Based on resources and schedules, estimate the calendar time that this effort will require.Carefully consider and estimate the effort required to execute work of that size.The Typical ProcessĪ normal estimation procedure, for estimating any kind of work goes like this: Effort is important because it is usually the primary driver of cost, inasmuch as we need to pay the people doing the work. However, if your team consists of three people, your effort is lower than if the team size is six or ten people working for the same amount of time. A project may take six months to deliver. How many person-hours (or person-days or weeks) will the software take to build? This is separate from the question of calendar time/duration. ![]() How long, in calendar terms, will the software take to build? This is strictly a measurement of the interval between the project start date and the software delivery date. You can measure a building in square feet, or a highway in miles, but there’s no universal measurement for a software project. Unlike the size of a physical object, software size is difficult to measure. How big is a software project? The software industry has experimented with many ways of measuring size: lines of code, for example, or the metric known as “function points”. (If you’re already familiar with these concepts, you can skip straight to our definition of story points.) Size To see why story points make sense, let’s take a step back and look at three key concepts in estimating and managing software projects. Doesn’t this make more sense? It’s a currency we all understand, so why aren’t they the preferred method in agile? 3 Keys to Software Projects Many of us, though, estimate our work in hours. However, as soon as we build feature A in eight hours, we can guess feature B needs about sixteen hours. We just know their estimated size relative to one another. ![]() We don’t know, exactly how much time or effort either feature will take, though. For example, if feature A is worth three story points and feature B is worth six, we expect feature B to take about twice as long as feature A. Story points allow a team to estimate the size of a software project in relative terms. They allow a software development team to accurately estimate and manage projects. Story points come out of the “agile” family of software development practices.
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