There are several, but the three most common are:
• Plan repair.
  Example: in the Supply Chain Example, take that state where all of the components are delivered to CENTRA but there are not enough free ports and make a new plan, which would be to ship the components back to the supplier for a disconnection, and then back to CENTRA.
• Reordering so that the negated condition occurs later.
  Example: In the Meeting a Friend at FRA plan, the solution was reordering.
• Inserting an earlier plan step with a goal to fix the negated condition.
  Example: in the Supply Chain Example, a disconnection step was inserted in order to free one port that was otherwise not needed in the plan.

We now consider some techniques that avoid such techniques, at least above the algorithmic level.