- OG0-091 Exam Snapshot: Format, Fee, and Scoring
- Domain-by-Domain Breakdown and Weighting
- Why ADM Phases Deserves Extra Attention
- Understanding the Question Style
- A Domain-Sequenced Study Timeline
- Registration and Fee Mechanics
- Who Actually Hires for OG0-091
- Common Mistakes That Sink First Attempts
- Frequently Asked Questions
- ADM Phases carries 9 of 40 questions (22.5%) - the single largest domain on OG0-091.
- You need 24 of 40 correct (60%) in 60 minutes to pass, closed-book, no prerequisites.
- ADM Phases plus ADM Guidelines and Techniques together make up 37.5% of the exam.
- The 2026 exam costs $375 as a booking fee or $400 as a retail voucher.
OG0-091 Exam Snapshot: Format, Fee, and Scoring
OG0-091, formally the TOGAF 9 Part 1 Examination, is the foundational credential in The Open Group's TOGAF certification track. It is a closed-book, supervised test delivered through Pearson VUE testing centers or via OnVUE remote proctoring, which means you can sit it from a home office or a local test center depending on what fits your schedule. The exam itself is short but dense: 40 simple multiple-choice questions to be answered in 60 minutes, with a passing threshold of 60%, or 24 correct answers.
There are no prerequisites for OG0-091, so candidates range from architects transitioning into enterprise roles to project managers and consultants who need TOGAF vocabulary to communicate with architecture teams. The body of knowledge is entirely drawn from the TOGAF 9 Standard, Version 9.2, so there is no ambiguity about source material - the challenge is depth and recall under time pressure, not guessing which reference applies.
Domain-by-Domain Breakdown and Weighting
OG0-091 is organized into eleven domains, and the weighting is not evenly distributed. Understanding where the points actually live is the difference between a study plan that feels thorough and one that actually gets you to 24 correct answers. For a full walkthrough of each content area, see the OG0-091 Exam Domains 2026: Complete Guide to All 11 Content Areas.
| Domain | Weight | Relative Priority |
|---|---|---|
| ADM Phases | 22.5% | Highest |
| ADM Guidelines and Techniques | 15% | Very High |
| The Enterprise Continuum and Tools | 10% | High |
| Architecture Governance | 10% | High |
| Basic Concepts | 7.5% | Moderate |
| Core Concepts | 7.5% | Moderate |
| Introduction to the ADM | 7.5% | Moderate |
| Architecture Views, Viewpoints, and Stakeholders | 5% | Lower |
| Building Blocks | 5% | Lower |
| ADM Deliverables | 5% | Lower |
| TOGAF Reference Models | 5% | Lower |
Notice that the top four domains - ADM Phases, ADM Guidelines and Techniques, The Enterprise Continuum and Tools, and Architecture Governance - account for 57.5% of the exam. If your study time isn't weighted toward these four areas, you're preparing against the wrong distribution.
Domain 1: Basic Concepts (7.5%)
Covers the purpose of enterprise architecture, the structure of the TOGAF document, and why organizations adopt architecture frameworks in the first place.
- Know the definition of a framework versus a method
Domain 2: Core Concepts (7.5%)
Focuses on the definitions of architecture, the four architecture domains (Business, Data, Application, Technology), and stakeholder concerns.
- Memorize the four architecture domain names and what each governs
Domains 1 and 2 are covered in depth in the OG0-091 Domain 1: Basic Concepts (7.5%) - Complete Study Guide 2026 and OG0-091 Domain 2: Core Concepts (7.5%) - Complete Study Guide 2026 resources, which break each objective into testable statements rather than abstract theory.
Why ADM Phases Deserves Extra Attention
The Architecture Development Method (ADM) is the operational heart of TOGAF, and ADM Phases is the largest single domain on OG0-091 at 9 of 40 questions. This domain tests your ability to identify what happens in each phase - Preliminary, Architecture Vision, Business Architecture, Information Systems Architectures, Technology Architecture, Opportunities and Solutions, Migration Planning, Implementation Governance, and Architecture Change Management - and, critically, the objectives and inputs/outputs unique to each.
Exam writers frequently test phase boundaries: what belongs in Phase A versus Phase B, or which phase produces a specific artifact. Rote memorization of phase names is not enough; you need to know the sequence, the purpose of each phase, and how the Requirements Management phase interacts continuously with all the others rather than sitting in a single position in the cycle.
Key Takeaway
Build a single-page ADM cycle diagram from memory, label each phase's primary objective, and quiz yourself on which phase owns which deliverable before moving to any other domain.
ADM Guidelines and Techniques, the second-largest domain at 15%, pairs directly with ADM Phases. It covers how the ADM is adapted - for different architecture styles, security considerations, iteration approaches, and stakeholder management techniques. Studying these two domains together, rather than in isolation, reflects how the actual exam blends them into applied scenario questions.
Understanding the Question Style
OG0-091 uses what The Open Group calls "simple multiple-choice" questions - a single correct answer selected from four options, unlike the scenario-based, multi-part questions found on the OG0-093 (Part 2) exam. This format rewards precise recall of definitions and structure over interpretive judgment, but don't mistake "simple" for "easy." Many questions hinge on distinguishing between closely related TOGAF terms, such as the difference between a deliverable and an artifact, or between a viewpoint and a view.
Because each question stands alone and carries equal weight, there's no partial credit for reasoning your way toward an answer - you either recall the exact TOGAF definition or you don't. This is why many candidates who assume general architecture experience is sufficient are surprised by their results; the exam tests TOGAF's specific vocabulary, not general industry knowledge. For a deeper look at what makes this test tricky, read How Hard Is the OG0-091 Exam? Complete Difficulty Guide 2026.
A Domain-Sequenced Study Timeline
Generic weekly study templates don't account for OG0-091's lopsided weighting, so the sequence below is built around domain size rather than a fixed calendar. Adjust the number of days per week based on your available time, but keep the domain order - front-load the highest-weighted material and use the final week purely for mixed-domain recall testing.
Foundations: Domains 1-3
- Read Basic Concepts, Core Concepts, and Introduction to the ADM sections of the TOGAF 9.2 standard
- Build a glossary of core terms (stakeholder, architecture, framework, ADM)
- Review the OG0-091 Domain 3: Introduction to the ADM (7.5%) - Complete Study Guide 2026 guide for phase-sequence orientation
Heavy Lifting: ADM Phases and Guidelines
- Diagram each ADM phase with objectives, inputs, and outputs
- Study adaptation techniques covered under ADM Guidelines and Techniques
- Drill phase-identification practice questions daily
Supporting Domains: Continuum, Governance, Views
- Study the Enterprise Continuum and Tools, using the OG0-091 Domain 4: The Enterprise Continuum and Tools (10%) - Complete Study Guide 2026 guide
- Cover Architecture Governance structures and the Architecture Board's role
- Review Views, Viewpoints, Stakeholders, Building Blocks, Deliverables, and Reference Models
Full-Length Practice and Weak-Spot Repair
- Take full 40-question timed practice exams on the practice test platform
- Re-study any domain scoring below 60% on practice attempts
- Do a final pass through ADM Phases and ADM Guidelines, since they carry the most points
For a broader look at how this timeline fits into an overall prep strategy, see the companion resource OG0-091 Study Guide 2026: How to Pass on Your First Attempt.
Registration and Fee Mechanics
For 2026, candidates can sit OG0-091 for a $375 exam booking fee or a $400 retail voucher fee, depending on how you purchase access. Both routes lead to scheduling through Pearson VUE, either at an authorized test center or through OnVUE online proctoring. There's no waiting period tied to prerequisites since none exist for this exam - you can register as soon as you feel ready.
A pass on OG0-091 earns the TOGAF 9 Foundation certification outright. That credential does not expire and carries no renewal requirement, so once you clear the 24-of-40 threshold, it stays on your record permanently. It also counts as partial credit toward the combined TOGAF 9 Certified designation if you plan to later take the Part 2 exam. For a full cost comparison including vouchers and bundled options, see OG0-091 Certification Cost 2026: Complete Pricing Breakdown.
Key Takeaway
Because TOGAF 9 Foundation never expires, there's no pressure to "keep it current" - treat your first attempt seriously since a pass here is permanent and stacks toward further certification.
Who Actually Hires for OG0-091
TOGAF 9 Foundation shows up most often in job postings for enterprise architect, solutions architect, IT strategy consultant, and business analyst roles at organizations running formal architecture governance programs - think large financial institutions, government agencies, systems integrators, and consulting firms. It's frequently listed as a baseline requirement rather than a differentiator, meaning many employers expect it as table stakes before considering a candidate for architecture-adjacent work.
Because the certification demonstrates fluency in a shared vocabulary - ADM phases, building blocks, architecture views - it's especially valued in environments where architects, project managers, and governance boards need to communicate using consistent terminology. If you're evaluating whether the investment makes sense for your career stage, the analysis in Is the OG0-091 Certification Worth It? Complete ROI Analysis 2026 and the role data in OG0-091 Jobs are worth reviewing before you register. Compensation trends tied to the credential are covered separately in OG0-091 Salary Guide 2026: Complete Earnings Analysis.
Common Mistakes That Sink First Attempts
Most failed attempts on OG0-091 don't come from lack of effort - they come from misallocated effort. The following patterns show up repeatedly among candidates who need a second attempt:
- Treating all eleven domains equally. Spending the same number of hours on TOGAF Reference Models (5%) as on ADM Phases (22.5%) leaves the highest-value material underprepared.
- Skipping the ADM Guidelines and Techniques domain. At 15%, it's the second-largest domain, yet candidates often treat it as a footnote to ADM Phases rather than studying it independently.
- Relying on architecture experience instead of the standard's exact language. The exam tests TOGAF 9.2's specific definitions, not how your organization informally uses similar terms.
- Not practicing under a 60-minute clock. Ninety seconds per question feels tight the first time; simulate it before exam day rather than discovering the pressure live.
- Ignoring lower-weighted domains entirely. Domains like Building Blocks and ADM Deliverables are only 5% each, but skipping them outright can cost you two questions you didn't need to lose.
If you want a data-informed view of how these mistakes translate into outcomes, OG0-091 Pass Rate 2026: What the Data Shows discusses what the available evidence suggests about first-attempt performance.
Frequently Asked Questions
You need 24 out of 40 correct, so you can miss up to 16 questions and still pass with the required 60%.
Start with Basic Concepts and Core Concepts to build vocabulary, then move quickly into ADM Phases and ADM Guidelines and Techniques since together they represent 37.5% of the exam.
Yes - $375 is the exam booking fee, while $400 is the retail voucher fee. Both grant access to the same 40-question, 60-minute OG0-091 exam through Pearson VUE.
No. OG0-091 has no prerequisites, so candidates can register regardless of prior architecture experience or other certifications.
No. Once earned, TOGAF 9 Foundation does not expire and has no renewal or continuing education requirement.
Passing OG0-091 comes down to matching your preparation to the exam's actual weighting rather than studying the TOGAF 9.2 standard cover to cover in equal measure. Prioritize ADM Phases and ADM Guidelines and Techniques, keep the lower-weighted domains from being total blind spots, and rehearse the 60-minute, 40-question format until the pacing feels automatic before you sit the real thing.