Schedule Logic is the capability of a schedule to be designed in the way that ensures logical connection between schedule elements such as activity and milestone. It means that the schedule content is harmonized by the relationship "predecessor-successor". Therefore, with the expectation of the start activity and milestone, every activity or milestone starts only after its preceding activity/milestone is totally or partially completed.
If a schedule is logical, then it complies with the practice of effective scheduling because this schedule does not include activities or milestones missing predecessors or successors. Such a schedule has the content that is ease to plan and monitor because activities and milestones are logically sequenced and can be performed in a predictable way.
The idea of schedule logic can be used in various fields of management. For instance, in project management logically designed and sequenced schedules allow planning tasks that are supposed to be performed one by one, in the sequence that ensures progressive development and implementation of projects.