- You must pass Fundamentals of Interpreting before you're eligible for the performance exam.
- The Fundamentals exam splits 60 questions in English and 60 in ASL, with no language choice.
- Failed knowledge exams require a three-month waiting period before you can retake.
- A 65db+ audiogram is required for Deaf-interpreter rates and eligibility, and doesn't need to be recent.
Understanding the CGKE Structure Before You Study
Before opening a single flashcard, you need to know exactly what you're preparing for. The CASLI Generalist Knowledge Exam (CGKE) replaced the legacy CDI-Knowledge Exam on January 1, 2021, and it is not a single test - it's two distinct components administered under one exam session by Meazure Learning (formerly Scantron) at contracted testing sites.
The first component, Fundamentals of Interpreting, contains 120 multiple-choice questions. Here's the part candidates consistently underestimate: 60 questions appear in written English with English answer choices, and the other 60 appear in ASL with ASL answer selections. You do not get to pick which language you're more comfortable with - both halves are mandatory, and this bilingual format alone changes how you should structure practice.
The second component is the Ethical Decision Making and Cultural Responsiveness Exam, made up of 8 multi-step case studies. This section doesn't test vocabulary recall - it tests judgment under realistic, layered scenarios involving competing ethical obligations, cultural context, and Deaf community norms.
For a deeper dive into scoring thresholds, see our CDI Passing Score guide, and for a full breakdown of what separates each content area, read the CDI Exam Domains Guide.
The Four Domains: What Actually Gets Tested
CDI content is organized around four domains that map to the real-world workflow of a Deaf interpreter assignment - from the moment you're contacted about a job to the follow-up after it ends. Studying domain-by-domain, rather than randomly cycling through practice questions, is the single most efficient way to prepare.
Domain 1: Pre-Commitment Activities
This domain covers everything that happens before you agree to take an assignment - assessing your own qualifications, identifying conflicts of interest, and determining whether the job matches your skill set and the consumer's needs.
- Recognizing when a job requires a CDI versus a hearing interpreter alone
- Evaluating language match, regional variation, and specialized vocabulary needs
- Identifying ethical red flags before accepting an assignment
Domain 2: Pre-Encounter Activities
Once an assignment is accepted, this domain tests preparation steps: gathering context, coordinating with the hearing interpreter team, and setting up the physical or logistical environment for success.
- Team communication protocols between CDI and hearing interpreter
- Requesting and reviewing background materials or case history
- Environmental and positioning considerations specific to Deaf interpreters
Domain 3: The Encounter
This is the largest practical domain - the actual interpreting process. It tests your ability to manage feed dynamics, adjust register, and make real-time decisions when communication breaks down.
- Working effectively from a hearing interpreter's feed
- Adjusting language for the Deaf consumer's specific communication style
- Intervening appropriately when miscommunication or cultural mismatch occurs
Domain 4: Post-Encounter Activities
The final domain covers what happens after the assignment ends - debriefing, documentation, and professional reflection.
- Appropriate debriefing practices with the interpreting team
- Maintaining confidentiality after the assignment concludes
- Self-assessment and identifying areas for professional growth
Notice that Domain 3 tends to carry the heaviest practical weight because it reflects the core function of the role, but all four domains show up across both the Fundamentals questions and the ethical case studies. If you want a full domain-by-domain weighting discussion, the CDI Exam Domains Guide goes deeper than we can here.
Registration, Fees, and Timing Mechanics
A surprising number of candidates fail their first attempt not because they didn't know the material, but because they misunderstood the administrative mechanics - deadlines, fees, and eligibility documents. Get this right first.
Who Does What
RID owns the eligibility requirements and awards the certification itself. CASLI develops and administers the actual tests. The knowledge exam is delivered through Meazure Learning at contracted sites, while the performance exam is scheduled directly with a Local Test Administrator - a different process with different lead times. Don't assume both exams are booked the same way.
Fee Structure (CDI Rate, Effective January 1, 2023)
| Exam Component | RID Member Rate | Regular Rate |
|---|---|---|
| CASLI Generalist Knowledge Exam (CGKE) | $225 | $280 |
| CASLI Generalist Performance Exam for CDI | $310 | $395 |
| Single retake (Fundamentals or Case Studies alone) | $140 | |
For a full cost analysis including bridge plan and audiogram-related expenses, see CDI Certification Cost: Complete Pricing Breakdown.
The Audiogram Requirement
To qualify for Deaf-interpreter rates and eligibility, you must submit an audiogram showing hearing loss of 65db or more in one or both ears. It does not need to be recent, but it must name you and identify the audiologist or office that performed the test. Get this document ready early - sourcing an old audiogram from a closed practice can take weeks.
Deadlines and Retake Waiting Periods
- Exams must be taken within one year of purchase or before the five-year testing cycle expires, whichever comes first.
- The full testing cycle runs five years from your first PASS notification.
- Knowledge exam results arrive within 10 business days; performance exam results take up to 90 days.
- If you fail the knowledge exam, you must wait three months before retaking it.
That three-month gap is exactly why cramming right before your first attempt is risky - a failed attempt costs you a full quarter of delay, not just a retake fee. For the full eligibility picture, including education requirements, see CDI Requirements 2026.
A Domain-Based Study Timeline
Generic study techniques like spaced repetition and timed review blocks only help if you're applying them to the right content at the right time. Below is a sample sequencing approach built around the CDI domains rather than generic test prep.
Domain 1 & 2 Foundations
- Master Pre-Commitment scenarios: role appropriateness, conflict-of-interest recognition
- Review Pre-Encounter logistics and CDI/hearing-interpreter team coordination protocols
- Drill vocabulary in both English and ASL formats to match the bilingual question structure
Domain 3 Deep Practice
- Work through case-study style scenarios focused on feed management and register shifts
- Practice recognizing when and how to intervene during a breakdown in communication
- Take a full-length practice test to gauge readiness for the split-language format
Domain 4 & Ethical Case Studies
- Review post-assignment debriefing and confidentiality standards
- Work through multi-step ethical case studies under time pressure
- Identify weak domains from practice test results and revisit them
Final Review & Logistics
- Confirm testing site, ID requirements, and audiogram documentation are ready
- Run a final timed practice session covering all four domains
- Rest before test day rather than cramming new material
Key Takeaway
Sequence your studying by domain, not by question type - mastering Domain 3 (The Encounter) in isolation before mixing it with ethical case studies makes weak spots easier to isolate and fix.
Preparing for the Performance Exam
Passing Fundamentals of Interpreting only unlocks eligibility - it doesn't prepare you for the performance component, which is scheduled separately with a Local Test Administrator and evaluated against the 2018 Deaf Interpreter Job Task Analysis. This exam tests your live application of all four domains simultaneously, not in isolated sections.
Because results can take up to 90 days to arrive, plan your professional timeline accordingly - don't count on certification for a job application or contract that starts within a few months of testing. If you're weighing whether the investment of time and the $395/$310 fee is worthwhile relative to career upside, our ROI analysis and CDI Salary Guide break down the earnings side in detail.
Many candidates find it useful to rehearse with realistic team-interpreting simulations before their scheduled date, since Domain 3 skills - working from a hearing interpreter's feed, adjusting register in real time - are difficult to build through reading alone. Practicing on a realistic CDI practice test platform before your performance exam date can help surface gaps in your Domain 2 and Domain 3 readiness that written study alone won't reveal.
Mistakes That Cause First-Attempt Failures
- Treating the exam as English-only. Since 60 of the 120 Fundamentals questions are presented in ASL with ASL answer choices, candidates who only study written materials are unprepared for half the exam.
- Skipping the audiogram until the last minute. The 65db+ hearing loss documentation requirement can take time to track down from a past audiologist - start early.
- Misjudging exam difficulty. The Ethical Decision Making case studies require applied judgment, not memorized rules. See How Hard Is the CDI Exam? for an honest difficulty assessment.
- Not knowing the retake rules. Failing one section doesn't mean retaking both - but it does mean a mandatory three-month wait before your next attempt.
- Ignoring documented outcome data. Review CDI Pass Rate: What the Data Shows before assuming your preparation level is sufficient.
For a condensed, printable reference of every fact in this guide, bookmark the CDI Cheat Sheet: One-Page Review of Must-Know Facts, and revisit the full CDI Study Guide as your central hub while preparing. If you're still confirming testing windows, check CDI Exam Dates 2026 before locking in a study schedule.
Frequently Asked Questions
No. The exam is fixed at 60 questions in written English with English answers and 60 in ASL with ASL answer selections. No language preference is permitted.
No. If you fail only Fundamentals of Interpreting or only the Ethical Decision Making and Cultural Responsiveness Exam, you retake only that specific section for $140.
A three-month waiting period is required before you can retake a failed knowledge exam.
No. It does not need to be recent, but it must show hearing loss of 65db or more in one or both ears and must name you along with the audiologist or office that conducted it.
The full testing cycle is five years from your first PASS notification, and each exam must be taken within one year of purchase or before that cycle expires, whichever comes first.
Once you're certified, understanding where CDIs actually work - courts, medical settings, mental health, education - matters just as much as passing the exam. Explore CDI Jobs and general career context in What Is CDI? and CDI Certification as you plan beyond test day. For continued hands-on preparation, explore practice exams built around these exact domains as part of your final review.