In the Innovative Professional Development (iPD) Challenge, the Bill & Melinda Gates Foundation has invested in helping school districts and networks redesign their instructional support systems to better support educators in increasing student success. This Issue Focus, the second in a series, presents early reflections from MDRC's evaluation of the iPD Challenge and is based on interviews with school and district staff and surveys of secondary school leaders conducted in four school districts during the 2013-2014 school year, the first year of iPD implementation.