This model is applicable for nurses who are working during
the lunch hour interval and require a break. A nurse is not allowed to leave the OR
until the case on which she is working is finished or another nurse with the appropriate skill
and competency is available to relieve her. Ideally, shift assignments and break assignments
would be made together. However, this is not practical because NAM instances of realistic size
are already too large to be solved exactly. Instead, we have developed a nurse lunch model (NLM)
that takes as input the solution of the NAM and
adjusts it to accommodate breaks.