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Estimates of effort and duration for a new software project often have to be adjusted to deal with an imposed target delivery date or a constraint on staffing. Estimating methods assume an effort/duration trade-off relationship based mostly on theory or expert judgment. This paper describes a process for analyzing actual project effort and duration data which is designed to explore the trade-off relationship. I assume a reference relationship of a simple power-curve with variable power &#x2018;N&#x2019; and use this (a) as a means of comparing the trade-off relationships assumed by four well-known estimating methods, and (b) as the basis for a process to analyze actual project data. Results are presented of applying the process to 16 sub-sets of project data. These suggest, for example, that the value of &#x2018;N&#x2019; differs between new development projects and enhancement projects. The Web Extra presents more results for each step in the effort-duration trade-off process described in the main article.