In 1985, Alex Krulikowski began a small start-up company that provided training and consulting in a little-known discipline called geometric dimensioning and tolerancing. Twenty-eight years later, Effective Training Inc. has evolved into a thriving business that provides GD&T training, products, and services to organizations across the globe.

Alex’s first publication was a GD&T Self-Study Workbook in 1986. Since then, he has written numerous textbooks, workbooks, pocket guides, self-study courses, videos, computer-based GD&T courses, and reference guides. Topics range from GD&T fundamentals to advanced concepts,  tolerance stacks, ISO GPS, and more.

In 1986, a small group of students took GD&T courses in the newly formed ETI classroom on Wayne Road in Westland, Michigan. Today, the company provides onsite workshops to major corporations all over the world.

The training format has evolved as well.

In 2004,  Alex developed the first interactive computer-based training GD&T software, and ETI’s GD&T Trainer is now a valuable training option used by small companies and industry giants.  Many educational institutions utilize ETI’s digital instructor kits, and online and video courses provide more GD&T learning platforms.

In 2012, the company moved to its new Livonia, Michigan-based headquarters, where more than a dozen employees create, sell, and distribute GD&T products, while several ETI instructors travel the world teaching GD&T courses. Recent products include a textbook, pocket guide, workshops, and computer-based training based on the latest (ASME Y14.5-2009) standard.

ETI has also published an ISO Geometrical Tolerancing Guide based on various ISO GPS standards. Their newest product is the ISO GPS Quick Reference software.

In nearly three short decades, Effective Training has expanded from a one-man operation into a company that has become the largest provider of GD&T products in the world.


Computer-Based Courses and Reference Materials – ASME and ISO GPS


Digital Instructor Kits


Self-Study Courses and Workbooks


ASME and ISO GPS Textbooks and Pocket Guides

Alex and ETI would like to thank our clients for supporting us for the past 28 years. We look forward to providing you with more  GD&T products and services in the future.

Read about ETI’s history.

Read about Alex.