another point of view
Estimating has been described as a stepchild in project management. Project management literature, seminars, and organizational policies and procedures have tended to avoid the subject of estimating. This tendency can be explained, in part, by the discipline-specific nature of estimating. It’s difficult to develop a set of universal rules that can be applied to the systems development project, the engineering project, the new product development effort, and other organizational undertakings. There are, however, some commonsense rules that can be applied, regardless of the substance of the project.