请教今年kellogg推荐信的一道题目

what are the three areas of the candidate's professional performance that have improved the most in the time you have known him or her?

请问如何理解 professional performance,? 是工作表现,还是工作能力?

我想，是工作方面的表现，包括工作能力，也包括其他方面，但都是professional的。