TY - JOUR TI - Working inside the Black Box: Assessment for Learning in the Classroom JF - Phi Delta Kappan AU - Black, Paul AU - Harrison, Christine AU - Lee, Clare AU - Marshall, Bethan AU - Wiliam, Dylan DO - 10.1177/003172170408600105 PY - 2004-09 EP - 21 SP - 8 SN - 0031-7217 SN - 1940-6487 IS - 1 VL - 86 ER -