Project Life Cycle: Predictive vs Adaptive Scheduling Approaches
PMBOK v8 Definition
The project life cycle defines how scheduling processes are tailored and applied throughout a project. In a predictive life cycle, the schedule is typically defined up front, with detailed planning and sequencing of tasks completed at the beginning, a project baseline created and approved, and changes conducted through formal change management procedures. In an adaptive life cycle, schedules are more flexible, with the project divided into sprints or iterations using short-term planning horizons. The choice of life cycle significantly influences how scheduling processes are applied.
Why It Matters for the Exam
This concept appears frequently in situational and definition-based questions testing your ability to distinguish between predictive and adaptive approaches. The PMI exam often presents a scenario describing how planning is conducted and asks you to identify which life cycle is being used, or which tailoring consideration applies. Understanding the fundamental differences in scheduling philosophy is essential for approximately 5-8% of exam questions.
Key Points to Remember (for the exam)
- Predictive Life Cycle: Schedule defined up front; detailed planning at the beginning; baseline created and approved; changes are less frequent and require formal change management procedures
- Adaptive Life Cycle: Schedules are flexible; project divided into sprints/iterations; short-term planning horizons; plans evolve throughout the project
- Tailoring Consideration: The life cycle and development approach selection significantly influences how scheduling processes are tailored and applied
- High-Level Planning: At project start, expected outcomes are identified and a high-level schedule is developed; intensive scheduling may be conducted up front then adjusted
- Progressive Elaboration: Even in predictive approaches, detailed schedules may be prepared progressively as the project unfolds; plan updates and refinements throughout the project life cycle are not uncommon
- Roadmapping: Highly iterative approaches perform brief, high-level planning up front (roadmapping) followed by frequent planning and replanning throughout the project life cycle
- Scope-Schedule-Finance Link: The Scope, Schedule, and Finance performance domains are closely linked; changes in any one will likely impact the others
Typical PMI Exam Example
A project manager is assigned to a software development project where requirements are expected to evolve. The team plans to deliver working functionality every two weeks and only plans the next iteration in detail. The project manager creates a high-level roadmap at the start but does not define the full project schedule upfront. Which life cycle is being applied?
Answer: Adaptive life cycle (sprints/iterations with short-term planning horizons)
PMI Exam Traps
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Trap: Confusing "predictive" with "no changes allowed" Reality: Changes are less frequent but still occur through formal change management procedures
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Trap: Thinking adaptive means "no planning at all" Reality: Adaptive approaches perform high-level planning (roadmapping) upfront plus frequent planning throughout
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Trap: Assuming predictive life cycles never update the schedule Reality: Plan updates and refinements throughout the project life cycle are not uncommon even in predictive approaches
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Trap: Confusing "schedule levels" with "life cycle type" Reality: Schedule levels can change depending on the approach (adaptive or predictive), practitioner, and organizational requirements
Important PMI Connections
| Related Concept | Relationship Type | Exam Attention Point |
|---|---|---|
| Scope Performance Domain | Closely linked to Schedule | Changes in scope will likely impact schedule; tested in integrated change control questions |
| Finance Performance Domain | Closely linked to Schedule | Schedule changes affect cost; tested in earned value management questions |
| Tailoring Considerations | Input to life cycle selection | Life cycle and development approach selection is a key tailoring consideration |
| Change Management Procedures | Applied in predictive life cycles | Formal change management is required for baseline changes in predictive approaches |
Quick Review Questions
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In which life cycle is the project baseline created and approved at the beginning, with changes conducted through formal change management procedures?
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A project manager creates a high-level roadmap at project start but only plans the next two-week iteration in detail. Which life cycle approach is being used?
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What is the relationship between the Scope, Schedule, and Finance performance domains according to PMBOK v8?
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True or False: In predictive life cycles, plan updates and refinements throughout the project life cycle never occur.
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What is the term used for the brief, high-level planning performed at the start of highly iterative approaches?
PMBOK v8 Reference
Section 2.3.3.1 - Life Cycle and Development Approach Selection (Tailoring Considerations for Schedule Management)