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Bottom Up estimating: Using the lowest level of work package detail and summarizing the cost associated with it. Then rolling it up to a higher level aimed and calculating the entire cost of the project. Parametric Estimating: Measuring the statistical relationship between historical data and other variable or flow.
WBS-based (bottom up) estimation Expert estimation Project management software, company specific activity templates Parametric models Formal estimation model COCOMO, SLIM, SEER-SEM, TruePlanning for Software: Size-based estimation models [15] Formal estimation model
Bottom-up techniques are based on detailed information and involve often experts. The following techniques belong here: Work Breakdown Structure (WBS) and Wide Band Delphi (WBD). We can also use the following techniques for estimating the test effort: Conversion of software size into person hours of effort directly using a conversion factor.
In project management (e.g., for engineering), accurate estimates are the basis of sound project planning. Many processes have been developed to aid engineers in making accurate estimates, such as Analogy based estimation; Compartmentalization (i.e., breakdown of tasks) Cost estimate; Delphi method; Documenting estimation results; Educated ...
Software size is a key input to any estimating model and across most software parametric models. Supported sizing metrics include source lines of code (SLOC), function points, function-based sizing (FBS) and a range of other measures. They are translated for internal use into effective size ().
In general, the IMP is a top-down planning tool and the IMS as the bottom-up execution tool. The IMS is a scheduling tool for management control of program progression, not for cost collection purposes. [10] An IMS would seek general consistency and a standardized approach to project planning, scheduling and analysis.
The Wideband Delphi estimation method is a consensus-based technique for estimating effort. [1] It derives from the Delphi method which was developed in the 1950-1960s at the RAND Corporation as a forecasting tool. It has since been adapted across many industries to estimate many kinds of tasks, ranging from statistical data collection results ...
Similar to the burndown chart, the burnup chart shows time on the horizontal axis and work completed on the vertical axis. The main difference is that the burnup chart starts on the bottom and rises as tasks are completed (opposite to the burndown chart). Another difference is that burnup charts usually have a line representing total work. [5]