The concern over big data and ramifications of its use permeates many, if not all, aspects of life in the 21st century. With the advent of online learning, another area of concern, one that directly impacts the world of education, has been added: the use of data within online professional development settings. In this article, we examine the type and nature of data that is now frequently collected within online professional development settings, and consider what additional data, if any, should be collected to help improve the education process. Research on the effects of online professional development is also suggested.