But people over the age of 40 or those with an eye condition may need more frequent testing.

Effective technologies use many evidence-based strategies (e.g., adaptive content, frequent testing, immediate feedback, etc.), as do effective teachers.

Tests vary from daily test of functions on critical wells to monthly or less frequent testing on wells with low likelihood of control problems.

While cordite propellant was manageable, it required a vigilant gunnery officer, strict cordite lot control, and frequent testing of the cordite lots in the ships' magazines.