Assess graduate students' ability to design and implement a difference‑in‑differences study evaluating the impact of mandatory paid family leave on women's labor force attachment. Tasks include defining treatment/control groups and outcomes, justifying identification (parallel trends), testing pre‑trends, estimating TWFE and modern staggered‑adoption estimators (e.g., Sun & Abraham or Callaway & Sant'Anna), clustering SEs, conducting event‑study and robustness checks, interpreting coefficients and policy implications, and diagnosing threats (selection, composition, timing). Brief code/pseudocode and result interpretation expected.