A summary of the number of suspected human error defects that occurred in a single week at a busy airlinemaintenance and repair facility is shown in Table 3. As the Quality Manager, you have been asked to prepare a fully annotated Pareto graphical presentation for the airline management. (Your chart should also include the cumulative percentage contribution from each defect)

Hence, by using the 80/20 rule, identify which defect categories require urgent attention.

Table 3. Number of suspected human error defects in one week at an airline MRO facility Suspect Human Error Defects Total % (SHED's) INCORRECT ASSY. OP 126 25.2 INCORRECT PARTS 45 9.0 MFG ERROR 20 4.0 MISSING PARTS 90 18.0 SUPERVISOR ERRORS 16 3.2 INADEQUATE MAINTENANCE 12 2.4 BOGUS PARTS (SUP's) 106 21.2 ILLEGAL REPAIRS 11 2.2 OTHER ERRORS 74 14.8 SUM of SHEDs 500 100