date that is used to constrain the start or finish of an activity. The type of constraint is identified by an alignment type .
see activity .
the calendar date that separates actual (historical) data from future (scheduled) data.
the amount of time that an activity can be delayed from its early start without delaying the project finish date. Total float is a mathematical calculation and can change as the project progresses and changes are made to the project plan. Also called "float," "slack," and "path float." See also free float .