Bottom-up estimating deals with the most detailed level of the Work Breakdown Structure (WBS). In the case of project cost estimates, it means assessing the cost of an activity by breaking it down into smaller work packages, and then adding them together until you arrive at the total summary cost. The term "bottom-up" refers to an approach that starts at the lowest detail level and works up to more general conclusions. But what is it and how do you use it? Learn all about the bottom up estimating approach in our guide. While there are several different techniques used to estimate costs, the most common (and accurate) approach is bottom-up estimating. When you are looking into building a detailed cost and time estimate for a work package, you need a technique to help you in the planning phase. The best way to avoid these errors is to use an estimation method that lets you factor in all relevant information about your product or service and allows for collaboration with your team members. While this approach might feel good, it can lead to inaccurate estimates that cause problems later in the project. The most common mistake teams make during this process is estimating based on their gut feeling. As a result, you need to estimate the cost and schedule for each feature in your project. You may have to make assumptions about the timeline, budget or technical requirements. In any project, there are going to be a number of unknowns.
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