CGL Study Guide 2026

Everything you need to pass the CGL exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.

CGL exam key facts

The Certified Genealogical Lecturer evaluation consists of an electronic portfolio requiring digital recordings of two lectures, accompanying syllabus handouts, presentation slides, a five-year lecture list, and development activities. Source
Each recorded lecture submitted for the Certified Genealogical Lecturer credential must be between 45 and 90 minutes long. Source
The Certified Genealogical Lecturer credential costs $225 to apply for as a second additional credential under BCG's tiered fee schedule. Source
Applicants denied the Certified Genealogical Lecturer credential may appeal the decision to BCG trustees within 60 days of notification. Source
The Certified Genealogical Lecturer credential expires concurrently with the holder's core Certified Genealogist credential on a five-year cycle. Source

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📋 CGL Exam Format at a Glance

100

Questions

120 min

Time Limit

70.00%

Passing Score

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📚 CGL Topics to Study (35)

Analytical Methods and Techniques · 7 cards Analytical Methods and Techniques · 7 cards Analytical Methods and Techniques · 7 cards Analytical Methods and Techniques · 7 cards Content Knowledge · 7 cards Content Knowledge · 7 cards Content Knowledge · 7 cards Content Knowledge · 7 cards Equipment Operation and Maintenance · 7 cards Equipment Operation and Maintenance · 7 cards Equipment Operation and Maintenance · 7 cards Equipment Operation and Maintenance · 7 cards Genetic Genealogy · 7 cards Professionalism · 7 cards Professionalism · 7 cards Professionalism · 7 cards Professionalism · 7 cards Analytical Methods and Techniques · 6 cards CGL Audience Engagement · 6 cards CGL Audience Engagement · 6 cards CGL Audience Engagement · 6 cards CGL Research Methodology · 6 cards CGL Research Methodology · 6 cards CGL Research Methodology · 6 cards Content Knowledge · 6 cards Data Analysis and Interpretation · 6 cards Documentation and Record Keeping · 6 cards Equipment Operation and Maintenance · 6 cards Laboratory Safety and Procedures · 6 cards Presentation Style · 6 cards

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✍️ Sample CGL Questions & Answers

1. Which element is required in a Proof Summary but NOT required in a Proof Argument?

✓ A title and identification of the research question

A Proof Summary is a standalone, titled document that identifies the research question and presents the conclusion, while a Proof Argument may be embedded in a narrative without a formal title block.

2. A projector used in a genealogy lecture presentation suddenly displays a color cast with a strong yellow tint. What is the most likely cause?

✓ The projector lamp is nearing end-of-life

Aging projector lamps shift toward yellow as the mercury vapor depletes, indicating the lamp needs replacement.

3. Why is staying current with industry developments important for CGL professionals?

✓ The field evolves and practitioners must adapt to provide quality service

Fields continuously evolve with new research, technology, and best practices that affect professional competency.

4. A genealogist's laptop battery drains much faster than when new during research trips. Which maintenance action is most appropriate?

✓ Calibrate or replace the battery and adjust power management settings

Battery calibration can restore accurate charge reporting, but significant capacity loss typically requires battery replacement.

5. How does 'reasonably exhaustive' differ from 'absolutely exhaustive' in GPS terminology?

✓ Reasonably exhaustive reflects what a competent genealogist would do given available resources; absolutely exhaustive is an impossible standard

The GPS uses 'reasonably exhaustive' because no researcher can consult every record ever created; the standard is professional competence, not perfection.

6. A CGL lecturer is presenting to a mixed audience of beginners and advanced genealogists. What is the best approach?

✓ Layer content by starting with foundational concepts, then adding depth that rewards advanced participants

Layered content respects all experience levels — beginners build a foundation while advanced attendees gain deeper insight from the same material.

🎯 Free CGL Practice Tests

Analytical Methods and Techniques · 7 questions Equipment Operation and Maintenance · 7 questions Genetic Genealogy · 7 questions Analytical Methods and Techniques · 7 questions Content Knowledge · 7 questions Content Knowledge · 7 questions Content Knowledge · 7 questions Content Knowledge · 7 questions Analytical Methods and Techniques · 7 questions Analytical Methods and Techniques · 7 questions

📖 CGL Guides & Articles

Your CGL Study Path

1. Learn with Flashcards → 2. Drill Practice Tests → 3. Take the Full Exam Simulation

🃏 CGL Flashcards (227)🏆 CGL Exam Simulation

What Practice Test Geeks adds beyond an AI chat for CGL

An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:

A timed, full-length CGL mock exam — 100 questions in 120 minutes with a 70% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
A fixed CGL question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
A printable CGL cheat sheet you can print or save as a PDF.
CGL flashcards built from the same question bank.
Free CGL practice tests with the correct answer shown after each question.

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How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

bcgcertification.org — Test delivery, eligibility, exam format, retake policy, score release, time limit, score validity, fees · verified Oct 2026