29 CFR 1910.119(g)(3) requires the employer to ascertain that each operator has received and understood the required training, and to prepare a record containing the identity of the employee, the date of training, and the means used to verify that the employee understood the training. The third item is the one most often missing. A sign-in sheet proves attendance, not understanding.

What OSHA Has Said

Feb 16, 2022
What a compliant training record contains
In a letter on contractor training, OSHA spelled out what PSM training records must include: the identity of the employee, the date of training, and the means used to verify that the employee understood the training. The employer responsible for the training must make sure adequate means were used to verify understanding and must keep the records.
Read OSHA Letter ↗
May 28, 1993
Testing whether operators actually understand
Asked whether operators could lose their jobs for failing a test after refresher training, OSHA said employers need "appropriate methods, such as written tests, oral examinations, simulation exercises, etc., to ensure that employees understand the training they have received," and that "only those who have demonstrated the ability to do their jobs safely" should work on hazardous processes. OSHA declined to weigh in on employment decisions.
Read OSHA Letter ↗
Nov 27, 1995
Challenge tests can cover knowledge, not skills
In a memo on a utility's plan to let employees test out of annual refresher classes, OSHA called challenge testing "an excellent tool" for confirming knowledge but "not a substitute for skills training." Where a standard requires both knowledge and work-practice refreshers, a challenge test can substitute only for the knowledge part, and an oral test must be certified by the test provider. OSHA recommended a one-year pilot with employee representatives involved.
Read OSHA Letter ↗

⚡ Key Compliance Takeaway

Every training record should answer three questions: who, when, and how you know they understood it. Name the verification method on the record, such as a written test with score, an observed demonstration, or a simulator exercise, and keep the evidence. If a third party or a host employer trains your people, check their records meet the same standard before you rely on them.