The schedule of a project is determined by information about each task, some of which you provide and some of which MacProject II calculates based on what you provide.
You supply MacProject II with the calendar settings, at least one project date, the task durations, and the resource information. MacProject II figures resource durations, slack times, the critical path, and the rest of the project dates.
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Basic Concepts
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Schedule Information
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The schedule is recalculated whenever you add or change a date or change durations or dependencies (assuming you have AutoCalc on).