A method and apparatus for establishing an average test time (T.sub.A)
include determining a first time interval (T.sub.G) nominally associated
with non-failing testing of a unit under test (UUT), and determining a
second time interval (T.sub.PR) nominally associated with troubleshooting
and repairing a failed unit under test. Additionally, a percent yield (Y)
nominally associated with a proportion of non-failing units under test is
determined. The average test time is a sum of the first time interval
associated with the non-failing testing of the UUT, and a ratio of the
second time interval associated with troubleshooting and repair of a
failed UUT with respect to the yield.