Prepare for CW21 by matching your study and supervised bench practice to AWCI's modular exam: three core components and at least two electives. The linked Standards and Practices publishes the written-exam format, the 32-hour practical schedule, and the 5.0 rubric pass standard with its retake rules. Review the tool list, Standards and Practices, practice written exam and the technical guide for each movement, and work through the two paper exercises here on timing traces and technical-guide reading.
What does the CW21 exam cover?
CW21 — Certified Watchmaker of the 21st Century — is AWCI's current watchmaker certification. It requires three core components and at least two of five elective components, taken in a modular order you choose. The linked Standards and Practices also publishes concrete exam parameters and a pass standard.
The preparation page specifies the modern structure: the exam is modular, so you choose which components to certify in, the order, and how many components you take on each exam date. Three cores are mandatory for everyone, and you pick at least two electives for the CW21 credential itself — you may take more electives to show additional proficiency. Candidates operate industry-standard equipment during the exam and are assessed on quality of work and meticulous detail.
The Standards and Practices document AWCI links — dated February 2011 — publishes the examination parameters for CW21: a written exam of 26 to 30 questions answered in a 3.5-hour time frame at approved examination sites, and practical sample tasks totalling 32.0 hours. Those tasks cover a complete quartz watch service, a complete automatic watch service with built-in defects to correct, a complete chronograph service with misadjusted functions, micromechanical procedures with recorded micro-measurements, and the written exam. Assessment is conducted by a panel of three assessors plus an AWCI representative, and practical work is rated on a seven-point rubric.
The pass standard is explicit: you must score at least a 5.0 rubric — 71.4 percent — on each of five performance tasks. If only three or four tasks reach that level, you may request to retake the one or two tasks that fell short, within one year of the original exam; per-task charges apply. If you still miss the minimum after that retake, you must wait one year and retake the entire examination at the current full cost.
One caution on version: AWCI's current pages describe the modular component format, while the assessment document it links is dated February 2011. Read both, and confirm with AWCI which logistics apply to your sitting before you plan around the older figures.
| Component | Type | Task |
|---|---|---|
| Written theory exam | Core | Written exam across theoretical subjects |
| Automatic chronograph | Core | Complete service on an automatic chronograph |
| Precision timing | Core | Complete service on an automatic movement |
| Quartz | Elective | Complete service on a quartz watch |
| Balance staffing | Elective | Restaff a manual wind watch |
| Case and bracelet refinishing | Elective | Refinish a watch case and bracelet |
| Water resistance | Elective | Troubleshoot, repair, and make a case water resistant |
| Micromechanics | Elective | Manufacture a tool or part with lathe and hand tools |
Official documents: CW21 (AWCI certification page) — awci.com/certification-standards/cw21/; Become a Certified Watchmaker (AWCI preparation page) — awci.com/certification-standards/watchmaker-preparation/; AWCI Standards and Practices for Watchmakers, February 2011 — Sections III-VI: examination, sample tasks, scoring, reading list, sample questions
Which official materials and tools should you review?
AWCI names specific preparation materials: a certification tool list, the Standards and Practices document, a 21st Century Standards class, a practice written exam, a bibliography, and movement-specific technical guides. Exam sessions may be cancelled below six participants, so confirm before booking travel.
AWCI lists concrete preparation steps rather than vague advice. Review the tool list — you must bring those tools to the examination. Study the AWCI Standards and Practices (S&P) document in depth, which AWCI strongly recommends; its reading list also marks specific titles as required reading for the CW21 and CMW21 examinations, including Fried's The Watch Repairer's Manual, McMahan's The Practical Guide to Modern Watch Oiling, Reymondin's Theory of Horology, the Witschi training course, and the Bulova School training manual. If you have not had formal watchmaker training in the last ten years, AWCI highly recommends its 21st Century Standards class. A practice written exam and a bibliography are also provided, alongside a study guide, watchmaking excellence articles, and preparation videos.
Four movement-specific technical documents are named on the preparation page — for the Ronda 715, ETA 6498, ETA 7750, and ETA 2824. On the events calendar, AWCI also runs a Watch 102 watchmaking theory course at its Harrison, Ohio headquarters, which AWCI describes as a must for anyone considering taking the CW21.
Practical scheduling facts to plan around: the 2026 fall CW21 exam was announced for September 21–25 at AWCI headquarters in Harrison, Ohio, with registration through Jason Champion, Education Director, at certification@awci.com. AWCI reserves the right to cancel a session if fewer than six participants register — check with AWCI before booking travel, and sign up early. The Standards and Practices confirms that charges apply per performance task and directs candidates to AWCI for current amounts, so treat any third-party fee figure as unconfirmed. If you need an accommodation or variance, the Standards require the request to reach the Board of Examiners 45 days before your testing date, with no accommodation granted after that point.
Editorial note: topic weights sometimes circulated in unofficial study summaries (for example, percentage splits by subject area) do not appear anywhere on AWCI's own pages. Treat any weight table like this guide's internal syllabus map as planning aids, not as official exam weighting.
Official documents: CW21 (AWCI certification page) — awci.com/certification-standards/cw21/; Become a Certified Watchmaker (AWCI preparation page) — awci.com/certification-standards/watchmaker-preparation/; AWCI Standards and Practices for Watchmakers, February 2011 — Sections III-VI: examination, sample tasks, scoring, reading list, sample questions; American Watchmakers - Clockmakers Institute (homepage and events) — 2026 Fall CW21 exam listing; Watch 102 course listing
Worked exercise: compare readings before proposing a repair
Keep every reading attached to its position and power state. Compare like conditions first. A change in a measured value is an observation; identifying its cause requires further evidence and the applicable technical documentation.
The paper exercise below asks you to calculate changes in supplied readings. It does not provide a pass limit, diagnose a fault, or prescribe an adjustment. Use the movement-specific guide and supervised practical instruction for those decisions.
Practice exercise
Original paper exercise. At full wind, the recorded dial-up rate is +2 seconds per day and amplitude is 285°. After 24 hours, the same position reads +8 seconds per day and 240°. Crown-up readings change from +5 seconds per day and 220° to +18 seconds per day and 205°. Calculate the rate and amplitude changes for each position. Do these numbers alone identify a defective part?
Show answer
Dial-up: the recorded rate increases by 6 seconds per day and amplitude decreases by 45°. Crown-up: the rate increases by 13 seconds per day and amplitude decreases by 15°. The figures alone do not identify a defective part.
Subtract each full-wind value from the corresponding later value: 8 − 2 = 6, 240 − 285 = −45, 18 − 5 = 13, and 205 − 220 = −15. These comparisons describe the supplied data. The exercise supplies neither manufacturer acceptance limits nor inspection findings, so a particular repair or pass/fail conclusion would go beyond its evidence.
Worked exercise: read the correct row in a technical guide
Before using a specification, match both the caliber and the stem position. The Ronda guide AWCI links covers the 702–715 family, and functions differ by caliber, so reading the correct row matters.
For calibres 705 and 715, the supplied technical guide lists a running position (position 1) and a date-correction position (position 2). Hand setting with a stop-second that interrupts motor impulses appears in the guide only for other calibres in the family — 703 and 713, and 708 — not in the same rows. Treat this as a document-reading exercise; use the applicable manual and supervised training for practical work.
Practice exercise
Original paper exercise using the Ronda 702–715 technical guide. For calibre 715, which stem position corresponds to ordinary running and which to date correction? The same guide lists hand setting with a stop-second that interrupts motor impulses for other calibres in the family — why would it be wrong to assume calibre 715 has the same function at the same position?
Show answer
For calibre 715, position 1 is the running position and position 2 is date correction. The hand-setting-with-interrupted-impulses function is listed only for other calibres in the guide, so assuming the same function for 715 would go beyond what the document states.
The guide separates functions by both stem position and calibre. A function shown for one calibre at a given position does not transfer to a neighboring calibre. First record the exact caliber, then read only the rows that apply to it.
Official documents: AWCI CW21 Ronda 715 technical guide — Electrical checking and casing/tools pages
Your preparation checklist
Use the official task descriptions to plan what you need to practise and document. Confirm the modules offered on your chosen date before arranging travel.
For each selected component, note the official task, the tools required, the relevant movement documentation and any questions to resolve with your instructor or AWCI. After supervised practice, compare the work and documentation with the applicable assessment criteria.
- Confirm the three core components and your selected electives.
- Review the current tool list and the technical guide for each relevant movement.
- Practise explaining observations, the evidence needed for a diagnosis and the limits of a proposed conclusion.
- Confirm fees, scheduling, time allowances and assessment requirements with AWCI.
Official documents: Become a Certified Watchmaker (AWCI preparation page) — awci.com/certification-standards/watchmaker-preparation/
Official documents
Facts checked against sources: