Test managers often need to make an initial estimate of the number of people that will be required to test a particularproduct, before the information or the time to do a detailed task breakdown is available. One piece of data that isalmost always available is the number of developers that are or will be working on the project in question. Commonsense suggests that there is a relationship between the number of testers and the number of developers.This article presents a model that can be used in describing that relationship. It is a heuristic method for predicting aratio of testers to developers on future projects. The method uses the model to predict differences from a baselineproject. A reader with some projects behind her will be able to come up with a rule-of-thumb model to suit her mostcommon situations, to understand when the model might not give accurate answers and what additional factorsmight need to be taken into consideration.
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