Existing long definition is: Describes an expected sequence of events for one of the participants of a study. E.g. Exposure to drug A, wash-out, exposure to drug B, wash-out, follow-up Change to: Describes an expected event or sequence of events for one of the subjects of a study. E.g. for a living subject Exposure to drug A, wash-out, exposure to drug B, wash-out, follow-up E.g. for a stability study: {Store sample from lot A at 25 degrees for 1 month}, {store sample from lot A at 40 degrees for 1 month}