This is generally the most common form of technical access work utilized.  This technique involves a qualified technical access individual moving about independently by climbing or walking while using lanyards as the means of protection.  This technique allows a great deal of mobility while remaining protected.  The inspector uses a pair of slings attached to a shock-absorbing device that is in turn attached to the inspector's harness.  The inspector can move about while one of the slings is attached to a structural member.  The second sling allows the inspector to attach to a point further along the structure before disconnecting the first sling; thus, maintaining 100% tie-off while moving about on the structure.