In Configuration Management, a baseline is an agreed description of the attributes of a product, at a point in time, which serves as a basis for defining change. A change is a movement from this baseline state to a next state. The identification of significant changes from the baseline state is the central purpose of baseline identification. Typically, significant states are those that receive a formal approval status, either explicitly or implicitly. An approval status may be attributed to individual items, when a prior definition for that status has been established by project leaders, or signified by mere association to a particular established baseline. Nevertheless, this approval status is usually recognized publicly. A baseline may be established for the singular purpose of marking an approved configuration item, e.g. a project plan that has been signed off for execution. Associating multiple configuration items to such a baseline indicates those items as also being approved. Baselines may also be used to mark milestones. A baseline may refer to a single work product, or a set of work products that can be used as a logical basis for comparison. Most baselines are established at a fixed point in time and serve to continue to reference that point (identification of state). However, some baselines, dynamic baselines, are established to carry forward as a reference to the item itself regardless of any changes to the item. These latter baselines evolve with the progression of the work effort but continue to identify notable work products in the project. Retrieving such a dynamic baseline obtains the current revision of only these notable items in the project. While marking approval status covers the majority of uses for a baseline, multiple fixed baselines may also be established to monitor the progress of work through the passage of time. In this case, each baseline is a visible measure through an endured team effort, e.g. a series of Developmental baselines. This progression is revealed when the baselines are compared with each other. A baseline may also be established as the basis for subsequent exclusive activities when the baselined products have met certain criteria. For example, certain activities reserved for items with a prior formal approval, such as formal change control procedures. Baselines themselves are valued not only to identify the notable state of work product(s) but also provide historical views of how work product elements have progressed together over time. When