For many projects objectives and related performance criteria can be refined progressively through the conceive, design, plan, and allocate stages of the PLC. However, in some projects (e.g., information systems or software development projects), it may not be practicable to ensure that all project objectives are well defined or crystallized prior to the execute stage. This becomes apparent in earlier stages, where go decisions acknowledge the situation. In this scenario 'control evaluation', undertaken each time a milestone is achieved, ought to include a 'configuration review' (Turner, 1992; Turner and Cochrane, 1993) of objectives currently achievable with the project. If these are unsatisfactory, further stages of design and plan may be necessary.
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