The Standard for Project Management: Principles and Performance Domains

PMBOK v8 Definition

The PMBOK® Guide—Eighth Edition establishes that project management work is performed within Project Management Performance Domains, and these domains are guided by the principles of project management. A principle is defined as "a fundamental norm, truth, or value that gives guidance for the project manager and project team." The relationship between principles and performance domains forms an integrated system that enables successful delivery of the project and intended outcomes. The eight project performance domains identified in the PMBOK® Guide work together as an integrated system, not as isolated silos.

Why It Matters for the Exam

The relationship between principles and performance domains is foundational to the PMI exam because every question about how a project manager should act or decide traces back to either a principle or a performance domain. Expect questions that test your ability to distinguish between a principle (a guiding value) and a domain (an area of activity). This concept appears in situational questions where you must select the correct domain or principle that applies to a given scenario.

Key Points to Remember (for the exam)

• Principles Guide Domains: Principles are fundamental norms, truths, or values that give guidance. Performance domains are where work happens. Principles are NOT processes—they are enduring guidance.

• Integrated System: The eight performance domains form an integrated system. They do not operate independently; they interact and overlap. The exam tests understanding that success requires balancing all domains.

• Evidence-Based Revision: The Eighth Edition is "the most evidence-based and community-driven revision to date," shaped by nearly 48,000 data points and global practitioner insights. This means the exam reflects real-world evidence, not theory alone.

• Tailoring is Required: The tools and techniques listed for project management activities are "neither intended to be comprehensive, nor required for any given project." The project team selects what is needed—this is tailoring, and it is frequently tested.

• No Prescriptive Processes: Unlike previous editions, PMBOK v8 does not prescribe mandatory processes. Instead, it describes performance domains where activities occur. The exam tests domain knowledge, not memorized process sequences.

• Common Confusion: Confusing a principle with a performance domain. Example: "Stewardship" is a principle (value-based guidance), while "Planning" is a performance domain (area of activity). Principles answer "why," domains answer "what."

Typical PMI Exam Example

A project manager is leading a complex infrastructure project in a highly regulated industry. During execution, the team encounters conflicting stakeholder expectations about quality standards. According to the PMBOK® Guide—Eighth Edition, which should guide the project manager's decision?

Answer: The project management principles, because principles provide fundamental guidance for the project manager and project team when navigating value-based decisions.

PMI Exam Traps

• Trap: Thinking principles are optional guidelines

• Reality: Principles are fundamental norms that give mandatory guidance—they are not optional suggestions

• Trap: Treating performance domains as sequential phases

• Reality: Performance domains are integrated and operate simultaneously throughout the project lifecycle

• Trap: Assuming all tools and techniques listed in the PMBOK® Guide are required

• Reality: They are "commonly used selections" but not required—tailoring determines what is appropriate

• Trap: Confusing the Eighth Edition structure with previous editions

• Reality: PMBOK v8 has four core sections (Introduction, Performance Domains, Tailoring, and Models/Methods/Artifacts), not the 49 processes of earlier editions

Important PMI Connections

Quick Review Questions

1. What is the relationship between project management principles and project management performance domains?

2. According to PMBOK v8, are the tools and techniques listed in the guide required for every project? Why or why not?

3. How many project performance domains are identified in the Eighth Edition, and what does it mean that they form an "integrated system"?

4. What makes the Eighth Edition "the most evidence-based and community-driven revision to date"?

5. A principle is defined as "a fundamental norm, truth, or value." How does this differ from a process or procedure?

PMBOK v8 Reference

Section 1.2 - Relationship of the PMBOK® Guide and The Standard for Project Management
Figure 1-1 - Relationship Between Project Management Principles and Project Management Performance Domains