This document provides definitions for various data sheet codes used when collecting data during tutoring sessions. Codes include AAA for alternate activities, OT for when a child is off task, IP for implementation problems, IN for invalid data, OH for procedures placed on hold, PT for probe trials, SA for when a child is absent, SI for when a child is ill, and SL for when a child arrives late. Tutors must get their TA's initials on coded sessions and justify any codes entered. Tutors should notify their TA if they have multiple instances of IPs, OTs, or absences within a small number of sessions.