Competencies and milestones are intended to fulfill the aim of outcomes-based education, in which desired outcomes of training, rather than content or hours in particular rotations, drive curriculum planning. Introduced in 2013, the Milestones program explicates performance within the 6 Accreditation Council for Graduate Medical Education (ACGME) competencies. Whereas competencies identify outcomes deemed essential for practice across specialties, Milestones elaborate specialty-specific skills, knowledge, and behaviors indicating progression within each competency. Park et al 1 examined national Milestone ratings of family medicine (FM) residents to investigate the reliability of Milestones data, evaluate learner-and program-level effects, and identify potential learning trajectories for each subcompetency. This analysis benefits from a large data set and harnesses opportunities for learning analytics based on ratings for 22 subcompetency Milestones for a cohort of 3872 residents who were assessed on Milestones every 6 months through their 3 training years in 514 programs. As expected, Milestone ratings improved over time. Althoughthe study identified trajectories that could provide signal about progress on competencies and time points when a resident might be flagged for further help, the main finding is that growth patterns are primarily based on the program, rather than individual trainees. The results suggest different stakeholders involved in rating resident performance, and interpreting and acting on those ratings, may vary in how they make sense of, or attach meaning to, the Milestones and their ratings. ACGME requirements prompt programs to create voluminous data, and yet programs must make sense to use and respond to that data. Program faculty are tasked with defining and generating