Construction sequencing determines the order of work tasks to ensure efficiency and meet project schedules. Critical path method (CPM) identifies the sequence of tasks that determines project duration. Tasks on the critical path cannot be delayed without delaying project completion. Other tasks (non-critical) have some float (flexibility in timing). Project managers identify dependencies between tasks. Some tasks cannot start until previous tasks are complete. Other tasks can occur in parallel. Proper sequencing minimizes project duration. Early starts on non-critical work can create additional critical path activities preventing delays. Procurement sequencing ensures materials arrive when needed. Ordering long lead-time items early prevents delays. Just-in-time delivery of materials reduces on-site storage. Weather considerations affect sequencing; outdoor work may be delayed by weather. Winter conditions may require different work sequences than summer. Interior work can proceed while exterior work is delayed. Inspections and approvals must be scheduled. Building permit approvals may delay project start. Trade inspections must be scheduled before work is covered. Coordination between trades affects sequencing. HVAC and electrical rough-in must precede drywall installation. Plumbing rough-in typically precedes concrete slab finishing in some cases. Resource constraints including labor and equipment availability affect sequencing. Large labor requirements may limit the number of simultaneous tasks. Equipment access to the site may require coordination. Contingency time is built into schedules for unexpected delays. Weather delays, material shortages, or labor unavailability require buffer time.