An apparatus, program product and method utilize an ABIST circuit provided
on an integrated circuit device to assist in the identification and
location of defects in a scan chain that is also provided on the
integrated circuit device. In particular, a defect in a scan chain may be
detected by applying a plurality of pattern sets to a scan chain coupled
to an ABIST circuit, collecting scan out data generated as a result of
the application of the plurality of pattern sets to the scan chain, and
using the collected scan out data to identify a defective latch in the
scan chain.