- What the Seven Domains Actually Are
- Domain Map at a Glance
- Domains 1 and 2: Needs Assessment and Adult-Learner Curriculum
- Domains 3 and 4: Lesson Plans and Learning Environment
- Domains 5, 6 and 7: Delivery, Measurement and Records
- How the Domains Meet the Written Exam
- Turning Domains into an Evidence Package
- Sequencing Your Preparation Around the Domains
- Renewal, Evaluations and Why Domains 6 and 7 Keep Mattering
- Frequently Asked Questions
- RAI means RETA Authorized Instructor, issued by the Refrigerating Engineers & Technicians Association (RETA), and the seven domains are instructional...
- The 2026 handbook lists the seven competencies without weights, so do not assume any domain counts more than another.
- The written exam is 85 multiple-choice questions in three hours, with 80% required to pass.
- Initial application and exam fee is USD 950, and RETA membership in good standing is required.
What the Seven Domains Actually Are
If you searched for "RAI exam domains" expecting a weighted blueprint like those published for many professional exams, the reality is different, and it is worth understanding before you plan anything. For the RETA Authorized Instructor credential, the seven domains come from the competency list in the 2026 RAI Exam Information Handbook (Revision 08), in the section on RAI instructional evidence and evaluations. They describe what a competent industrial refrigeration instructor must be able to demonstrate. They are not a published breakdown of the written exam into seven scored sections.
That distinction shapes everything. The RAI sits at the intersection of two worlds: deep industrial refrigeration experience (the eligibility path requires six years of it) and the craft of teaching adults. The seven domains cover the second world almost entirely. They ask whether you can assess a training need, build a curriculum, plan lessons, run a classroom, deliver content, measure learning, and keep the records that prove it all happened. For the broader picture of what the credential is, see What Is RAI Certification? and the overview at RAI Certification.
Domain Map at a Glance
Here are the seven competencies exactly as the handbook frames them, paired with the kind of evidence or knowledge each one tends to demand. The right-hand column is preparation guidance, not an official exam outline.
| Domain | Published competency | What to be ready to show or explain |
|---|---|---|
| 1 | Properly doing a needs assessment | How you identify who needs training, on what, and why |
| 2 | Developing a curriculum appropriate for adult learners | Course structure, objectives, sequencing for working technicians |
| 3 | Developing and using lesson plans | Plans with objectives, activities, timing, materials |
| 4 | Establishing and maintaining a good learning environment | Classroom or shop climate, safety, participation |
| 5 | Delivering a training message and instruction effectively | Presentation methods, clarity, handling questions |
| 6 | Establishing a measurement system for student learning | Quizzes, practical checks, evaluations tied to objectives |
| 7 | Demonstrating an ability to establish and maintain a record keeping system | Rosters, results, evaluations, documentation trail |
Notice the arc: Domains 1 to 3 are planning, 4 and 5 are delivery, and 6 and 7 are verification. That planning-delivery-verification rhythm is a useful mental model, and it mirrors how RETA wants an instructor to operate in practice.
Domains 1 and 2: Needs Assessment and Adult-Learner Curriculum
Domain 1: Properly Doing a Needs Assessment
Before a single slide exists, an authorized instructor determines what the audience actually needs to learn. In industrial refrigeration, that gap is often between what technicians do on the job and what safe, compliant, efficient practice requires.
- Distinguish a knowledge gap from a skills gap or a procedural gap
- Identify the audience: operators, maintenance technicians, supervisors, new hires
- Gather input from the people who will be trained and the people who employ them
- Translate findings into learning objectives you can later measure
The common trap here is skipping straight to content. Candidates with strong technical backgrounds love to teach what they know best. The domain tests whether you teach what the learners need. Practice articulating, in a sentence or two, how you would decide that a given plant crew needs a particular course and what evidence would convince you.
Domain 2: Developing a Curriculum Appropriate for Adult Learners
Adults who work around ammonia and industrial refrigeration systems are not students in the traditional sense. They bring experience, limited time, and a strong need to see relevance. A curriculum aimed at them has to respect that.
- Write objectives in observable terms, not vague intentions
- Sequence material from familiar to unfamiliar, anchoring new ideas to field experience
- Balance lecture, discussion, demonstration, and hands-on practice
- Make the connection between each topic and a real task explicit
Your curriculum evidence matters well beyond the written exam. The eligibility path calls for curriculum and sample-lesson evidence, so what you develop for these two domains does double duty. See RAI Requirements 2026: Eligibility, Prerequisites & How to Qualify for the full prerequisite list.
Domains 3 and 4: Lesson Plans and Learning Environment
Domain 3: Developing and Using Lesson Plans
This domain has two verbs worth noticing: developing and using. A beautiful plan that never guides the actual session does not satisfy the competency.
- Structure a plan with objectives, an opening, content segments, activities, checks for understanding, and a close
- Allocate realistic time to each segment
- List materials, equipment, and any reference documents required
- Show how you adapt the plan when the room tells you something unexpected
Domain 4: Establishing and Maintaining a Good Learning Environment
In an industrial refrigeration setting, the environment is both psychological and physical. It includes whether learners feel safe to ask a question and whether the room or shop floor is arranged so that demonstrations are visible and safe.
- Set expectations and ground rules early
- Encourage participation without putting experienced technicians on the spot in counterproductive ways
- Manage distractions, differing experience levels, and dominant personalities
- Keep safety awareness present whenever equipment or hazards are discussed
Domains 3 and 4 are where weak instructors reveal themselves. An expert who cannot keep a room engaged, or who runs over time because nothing was planned, undermines even excellent technical content.
Domains 5, 6 and 7: Delivery, Measurement and Records
Domain 5: Delivering a Training Message and Instruction Effectively
Delivery is where planning meets people. The competency covers how clearly and persuasively you convey the message.
- Use plain language and define terms before relying on them
- Vary methods so that listeners, doers, and watchers all get something
- Use questions to check understanding rather than asking "does everyone get it?"
- Handle tough questions honestly, including saying you will confirm an answer
Domain 6: Establishing a Measurement System for Student Learning
An instructor who cannot show that learning occurred has not finished the job. This domain asks you to design how you will know.
- Match each assessment to a stated learning objective
- Use a mix of knowledge checks and practical demonstrations where appropriate
- Interpret results and adjust instruction when they show a gap
- Gather student feedback on the training itself
Domain 7: Demonstrating an Ability to Establish and Maintain a Record Keeping System
The least glamorous domain is often the one that trips people up, because it requires discipline rather than insight.
- Keep rosters, assessment results, and evaluation forms organized and retrievable
- Define what you retain, for how long, and where it is stored
- Ensure records could support a later question about who was trained in what
- Connect your system to the documentation RETA expects for renewal
Key Takeaway
Treat Domains 6 and 7 as a pair. Measurement produces data, and record keeping preserves it. An instructor who can design a quiz but cannot show where the results live has covered only half the ground.
How the Domains Meet the Written Exam
The seven domains describe instructional competence, and the written exam is one piece of the larger certification process. Here is what the 2026 materials say about that written component specifically.
| Item | Detail |
|---|---|
| Format | Multiple-choice, in English |
| Length | 85 questions |
| Time | Three hours (applies to the written exam only, not Train the Trainer or evidence review) |
| Passing requirement | At least 80% correct |
| Delivery | Proctored computer testing via the Kryterion Testing Network and RETA Network Test Centers; scheduling through RETA staff |
| Initial application/exam fee | USD 950 |
| Retest limits | Once every four months, twice in twelve months |
Be careful not to over-read the relationship between the table above and the seven domains. The materials do not say that the 85 questions are distributed across seven labeled sections. Prepare for the domains as the substance of instructional competence, and prepare separately for the written exam as a three-hour, 80% hurdle. For the scoring threshold in detail, see RAI Passing Score 2026: Exactly What You Need to Pass, and for scheduling, RAI Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Because no current issuer pass rate has been verified, treat any pass-rate figure you encounter with suspicion. The 80% figure is the score you must reach, not the share of candidates who succeed. The reasoning is laid out in RAI Pass Rate 2026: What the Data Shows, and a realistic sense of difficulty is in How Hard Is the RAI Exam? Complete Difficulty Guide 2026.
Turning Domains into an Evidence Package
This is the part most generic guides miss. The domains are not only things you study; they are things you document. Because the handbook places the competency list under "instructional evidence and evaluations," think of each domain as a question an evaluator could ask: where is your proof?
What the eligibility path asks you to assemble
- Six years of industrial refrigeration experience, with Verification of Experience
- Documented instructor experience
- A resume
- Four professional references, with no more than one from the same company or source
- Curriculum and sample-lesson evidence
- Completion of RETA Train the Trainer
- Compliance with the Code of Conduct
- Certification Committee approval
- RETA membership in good standing
Which domain feeds which artifact
- Needs assessment (Domain 1) becomes a short written rationale for why your course exists and who it serves.
- Curriculum (Domain 2) and lesson plans (Domain 3) become your curriculum and sample-lesson evidence.
- Environment and delivery (Domains 4 and 5) show up in how you describe and demonstrate your teaching approach, including Train the Trainer.
- Measurement and records (Domains 6 and 7) become sample assessments, evaluation summaries, and your documentation system.
Start gathering these artifacts before you register for the exam, not after. Costs and timing interact here, so review RAI Certification Cost 2026: Complete Pricing Breakdown as you plan your budget.
Sequencing Your Preparation Around the Domains
RETA offers no RAI-specific study guide or practice test. Its handbook points instructors to CARO, CIRO, CRST, and CRES study resources, but that does not make those exams' domains the RAI syllabus. Your preparation therefore has to be built from the seven competencies themselves plus the technical background you already carry. The schedule below is one reasonable way to order the work; adjust it to your own gaps.
Planning Domains (1, 2, 3)
- Draft a needs-assessment rationale for a course you could teach
- Write objectives and a curriculum outline for adult technicians
- Build one full lesson plan; this doubles as sample-lesson evidence
Delivery Domains (4, 5)
- Rehearse a segment aloud and time it against your plan
- List the ground rules and safety statements you would open with
- Prepare answers to the three hardest questions a veteran technician might ask
Verification Domains (6, 7)
- Create assessments mapped one-to-one to your objectives
- Design a records system: what you keep, where, and for how long
- Review the renewal documentation requirements so your system supports them
Exam Readiness
- Work through multiple-choice questions on all seven areas
- Confirm calculator, ID, and scheduling details with RETA staff
- Reread your weakest domain and fix the gap
Why this order? Planning comes first because every later domain depends on objectives written in Domains 1 to 3. Measurement and records come last because they only make sense once there is something to measure. For a fuller week-by-week method, see RAI Study Guide 2026: How to Pass on Your First Attempt, and when you want a rapid recap near test day, RAI Cheat Sheet 2026: One-Page Review of Must-Know Facts. To check your readiness with exam-style questions, use the RAI practice tests on the main site.
Renewal, Evaluations and Why Domains 6 and 7 Keep Mattering
Earning the credential is not the end of the domain story. Renewal comes every three years and requires continued RETA membership, 24 relevant PDHs, 25 student training evaluations submitted directly by students, the required documentation, and USD 735. If your average training-evaluation score falls below 4.0, you must repeat Train the Trainer.
Read that carefully through the lens of the domains. Student evaluations are measurement (Domain 6). Collecting 25 of them and keeping them organized is record keeping (Domain 7). The 4.0 average is effectively a verdict on delivery and environment (Domains 4 and 5). The competencies you study to qualify are the same ones that determine whether you can keep the credential.
If you are weighing the investment, Is the RAI Certification Worth It? Complete ROI Analysis 2026 and RAI Salary Guide 2026: Complete Earnings Analysis cover the career side, and RAI Jobs looks at who uses certified instructors. If you are still orienting yourself on the terminology, What Does RAI Stand For? clears up the acronym. When you are ready to test yourself, head to the RAI exam practice platform.
Frequently Asked Questions
No weights are published. The seven items are the instructional competencies listed in RETA's 2026 RAI Exam Information Handbook, presented as unweighted preparation topics rather than a written-exam blueprint. Do not assume one domain carries more questions than another.
The materials do not say so. The written exam is described as 85 multiple-choice questions in three hours, with at least 80% needed to pass. The seven domains describe the instructor competencies you should be able to demonstrate, not seven labeled exam sections.
No. RETA offers no RAI-specific study guide or practice test. Its handbook directs instructors to CARO, CIRO, CRST, and CRES study resources, but those exams' domains are not the RAI syllabus. Build your preparation around the seven competencies and your own technical and teaching experience.
Outside books, study-guide copies, and phones are prohibited. Issuer-provided onscreen reference PDFs are available, and you should bring a nonprinting, nonprogrammable calculator with cleared memory. Using CTRL+F may trigger a security logout, so avoid depending on it.
RAI testing is limited to once every four months and twice in twelve months. The re-examination fee is stated as USD 735 in the 2026 handbook, but an earlier application-page figure of USD 685 could not be rechecked, so confirm the current amount with RETA before paying.
Begin with needs assessment, curriculum, and lesson plans (Domains 1 to 3), because objectives written there drive everything else. Save measurement and record keeping (Domains 6 and 7) for later, once you have a course to measure and document.