Project dependency mapping creates network diagrams showing finish-to-start, start-to-start, finish-to-finish, and start-to-finish relationships between activities. This technique reveals hidden dependencies, resource conflicts, and cascade failure points that could derail schedules. Dependencies may be mandatory (hard logic), discretionary (soft logic), external (outside project control), or resource-based. A construction project mapped dependencies revealing that permit approval delays would cascade to 23 downstream tasks, prompting early engagement with regulatory authorities and buffer time allocation.