context - the day's topic, i.e. colors/numbers/Halloween lesson etc.
phase - either S for "study" (when you introduce new words, for example) or A for "activity" or "engage" when you sing a song or do something to get your students' attention
interaction - either T-S for some teacher to student interaction (e.g. drilling new vocabulary) or S-S when the students get to interact, for example a role-play or something.
Hope this makes sense
