Definitions of teacher experience vary by state and research study. Most states consider a teacher inexperienced if they have between 1-5 years of experience in the classroom as full-time educator. Pennsylvania's 2015 plan identified inexperienced teachers as those with one or less years of teaching experience, but the federal Civil Rights Data Collection definition for inexperienced teachers includes first or second year teachers. Using personnel records from the Pennsylvania Department of Education (PDE), this Allegheny County Education Research (ACER) report, takes a closer look at teacher experience in Allegheny County, examining whether equity gaps exist between district and charter schools and between student subgroups.