Whenever possible, get copies of performance reviews from previous jobs. Ask candidates to submit these late in the process to make sure answers are not tuned to what is already in the reviews. Having said that, don’t “over read” the reviews as your needs and their old situation may differ. Also remember that most big companies that conduct reviews (even small companies should but don’t often do them) are not entrepreneurial and define jobs pretty linearly and are often political.
What do the reviews say? What does the candidate believe their boss / peers / direct reports would say they did well? How does it compare to candidates self-assessment of strengths and weaknesses?