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1. IsolationIsolating dirty, contaminated areas from clean areas. 2. BarrierPreventing fluid penetration. 3. Sterile FieldCreating a sterile operative environment by aseptic application ofsterile materials. 4. Sterile SurfaceCreating a sterile surface on the skin which acts as a barrier to preventskin flora from migrating to the incision site. 5. Fluid ControlChanneling and collecting body and irrigation fluids.