Project Life Cycle: Phases, Development Approaches, and Delivery Cadence

PMBOK v8 Definition

A project life cycle is the series of activities and/or phases that a project passes through from its start to its closure. The project life cycle provides the foundational framework for managing a project, regardless of the specific project work involved or the adopted project development approach. The five factors explored within the project life cycle are: project phases, project development approaches (predictive, adaptive, hybrid), considerations for selecting a development approach, delivery cadence, and Project Management Focus Areas.

Why It Matters for the Exam

This concept appears frequently in situational questions where you must determine the appropriate development approach or phase structure for a given project scenario. PMI tests your ability to distinguish between predictive, adaptive, and hybrid approaches, and to understand how phases interact with Focus Areas. Questions often present a project description and ask which life cycle factor is most relevant or which development approach should be selected.

Key Points to Remember (for the exam)

• Project Phase Definition: A collection of logically related project activities that culminates in the completion of one or more deliverables and/or outcomes. Phases may be sequential, transitional, or overlapping.

• Three Development Approaches: Predictive (waterfall, plan-driven), Adaptive (agile, iterative, incremental), and Hybrid (combination of both). These exist on a spectrum from predictive to adaptive.

• Focus Areas are NOT Phases: The five Focus Areas (formerly Process Groups) interact within each phase and often overlap simultaneously—they are not sequential like phases.

• Life Cycle Flexibility Includes: Selecting the development approach or mix of approaches; identifying types of processes and activities to perform; adjusting activity, phase, or process attributes (name, duration, entrance criteria, exit criteria).

• Development Approach vs. Development Phase: The development approach defines how the project will be managed and executed. The development phase is a specific stage where actual creation and testing of deliverables occur.

• Common Confusion: Thinking Focus Areas (Initiating, Planning, Executing, Monitoring & Controlling, Closing) are the same as project phases. Reality: Focus Areas operate within each phase and overlap.

Typical PMI Exam Example

A project involves developing a new medical device with strict regulatory requirements and well-defined specifications. The team knows exactly what to build. Which development approach is most appropriate?

Answer: Predictive (waterfall) approach, because requirements are clear, stable, and regulatory compliance demands sequential, documented phases.

PMI Exam Traps

• Trap: Assuming adaptive approaches are always better for complex projects. Reality: Adaptive works best when requirements are uncertain or evolving; predictive is better when requirements are clear and stable.

• Trap: Confusing "project phases" with "Project Management Focus Areas." Reality: Phases are sequential collections of activities producing deliverables; Focus Areas are process categories that repeat within each phase and overlap.

• Trap: Thinking hybrid means using predictive for planning and adaptive for execution only. Reality: Hybrid can mix approaches at any level—some phases predictive, others adaptive, or combining elements within a single phase.

• Trap: Believing a project must use only one development approach. Reality: The project life cycle should be flexible enough to select a development approach or mix of approaches.

Important PMI Connections

Quick Review Questions

1. A project has high uncertainty in requirements and needs frequent stakeholder feedback. Which development approach is most suitable?

2. True or False: Project phases and Project Management Focus Areas are the same concept because both involve planning and executing activities.

3. A project team decides to use predictive planning for regulatory documentation but adaptive iterations for software development. What development approach is being used?

4. What are the three ways project phases can be structured in relation to each other?

5. When a project manager adjusts the entrance criteria and duration of a phase, what aspect of the project life cycle is being applied?

PMBOK v8 Reference

Section 4 - Project Life Cycles (including subsections 4.1 Project Phases, development approaches, and Focus Areas)