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An ABC Chart is a direct observation tool that can be used to collect information about the events that are occurring within a student's environment. "A" refers to the antecedent, or the event or activity that immediately precedes a problem behavior. The "B" refers to observed behavior, and "C" refers to the consequence, or the event that immediately follows a response.
Momentary time sampling is a sample of the defined behaviour in the exact instant that you're taking data. The observer would define the interval of time, let's say 5 minutes, and look up at the end of the interval. At the 5-minute mark, the observer would record whether the behaviour is occurring or is not occurring.