Editing Systems development life cycle (section)

=== Baselines ===
Baselines{{Clarify|reason=What is a baseline?|date=January 2023}} are established after four of the five phases of the SDLC, and are critical to the [[Iteration|iterative]] nature of the model.<ref>[[Blanchard, B. S.]], & [[Fabrycky, W. J.]](2006) ''Systems engineering and analysis'' (4th ed.) New Jersey: Prentice Hall. p.31</ref> Baselines become milestones.

* functional baseline: established after the conceptual design phase.
* allocated baseline: established after the preliminary design phase.
* product baseline: established after the detail design and development phase.
* updated product baseline: established after the production construction phase.