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Characteristics of the Project Life Cycle

Characteristics of the Project Life Cycle

The project life cycle defines the phases that connect the beginning of a project to its end. For example, when an organization identifies an opportunity to which it would like to respond, it will often authorize a feasibility study to decide whether it should undertake the project. The project life cycle definition can help the project manager clarify whether to treat the feasibility study as the first project phase or as a separate, stand-alone project. Where the outcome of such a preliminary effort is not clearly identifiable, it is best to treat such efforts as a separate project. The phases of a project life cycle are not the same as the Project Management Process Groups described in detail in Chapter 3.

The transition from one phase to another within a project’s life cycle generally involves, and is usually defined by, some form of technical transfer or handoff. Deliverables from one phase are usually reviewed for completeness and accuracy and approved before work starts on the next phase. However, it is not uncommon for a phase to begin prior to the approval of the previous phase’s deliverables, when the risks involved are deemed acceptable. This practice of overlapping phases, normally done in sequence, is an example of the application of the schedule compression technique called fast tracking.

There is no single best way to define an ideal project life cycle. Some organizations have established policies that standardize all projects with a single life cycle, while others allow the project management team to choose the most appropriate life cycle for the team’s project. Further, industry common practices will often lead to the use of a preferred life cycle within that industry.

Project life cycles generally define:

  • What technical work to do in each phase (for example, in which phase should the architect’s work be performed?)

  • When the deliverables are to be generated in each phase and how each deliverable is reviewed, verified, and validated

  • Who is involved in each phase (for example, concurrent engineering requires that the implementers be involved with requirements and design)

  • How to control and approve each phase.

Project life cycle descriptions can be very general or very detailed. Highly detailed descriptions of life cycles can include forms, charts, and checklists to provide structure and control.

Most project life cycles share a number of common characteristics:

Although many project life cycles have similar phase names with similar deliverables, few life cycles are identical. Some can have four or five phases, but others may have nine or more. Single application areas are known to have significant variations. One organization’s software development life cycle can have a single design phase, while another can have separate phases for architectural and detailed design. Subprojects can also have distinct project life cycles. For example, an architectural firm hired to design a new office building is first involved in the owner’s definition phase while doing the design, and in the owner’s implementation phase while supporting the construction effort. The architect’s design project, however, will have its own series of phases from conceptual development, through definition and implementation, to closure. The architect can even treat designing the facility and supporting the construction as separate projects, each with its own set of phases.

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