An instructor has been teaching for three hours on the first day of a three-day...

Give an advanced activity to the other learners and re-teach the morning activity to the learner who has not mastered the concepts.

Re-teach the concepts taught in the morning session to the class, but use different handouts.

Pair the learner with one of the more advanced learners who likes to share knowledge.

Continue to teach the course as outlined, and after class offer to help the learner who has not mastered the concepts.