The Teacher-Child Interaction Direct Observation Scale (TCIDOS) is a direct observation interval recording system that measures the occurrence of teachers’ use of the BEST in CLASS practices as well as teacher-child interactions, and child behaviors. During BEST in CLASS implementation, the TCIDOS is used to provide graphical feedback during coaching. Observation sessions last a total of 15 minutes per teacher-child dyad. In the 15-minute observation session, there are a total of sixty, 15-second intervals. Each interval is broken down into a 10 sec observation period and a 5 second recording period.