nFor
each Extension Condition, you can:
nClean Up Mess and Bail Out (CUMABO)
nInteract with the user for a few extra steps and reenter
the MSS
nFork to a different Use Case
nDeciding
which Extension Conditions to handle, and how, is one of the biggest
problems you will have
nYou don’t know them all up front, so they
always hit you unexpectedly
nThey take resources to solve…