Final answer:
Conscientiousness is the Big Five personality factor that predicts how well employees perform in training programs.
Step-by-step explanation:
In the Big Five personality model, the factor that predicts how well employees perform in training programs is Conscientiousness. Conscientiousness is characterized by traits such as competence, self-discipline, thoughtfulness, and achievement-striving. People who score high on conscientiousness are hardworking and dependable, which makes them more likely to perform well in training programs.