Which of the following describes a method where trainees must supply the missing information from memory?

The method where trainees must supply the missing information from memory is known as completion. This technique requires learners to fill in blanks or complete sentences based on what they have retained from their training material. It effectively assesses recall, requiring students to actively retrieve knowledge rather than merely recognize it from a list of options. This active engagement can enhance the learning process as it encourages deeper cognitive involvement.

Labeling typically involves identifying parts of a diagram or chart and does not require memory recall in the same way. Free response testing allows for more open-ended answers but does not specifically focus on supplying missing information in a structured format. Matching, on the other hand, involves pairing items from two lists and relies on recognition rather than recall, which is a different learning activity altogether. Each of these methods has its own merits, but in terms of requiring recall to complete a statement or answer, completion is the most accurate descriptor.