This chapter presented the solutions for two use cases for RMO Look up item availability and Process new order. Design three layer solutions for two more use cases, Create new order and Record order fulfillment. Update the design class diagram for the problem domain classes with method signatures from these use case designs. Often the sequence diagram to produce a report can be quite interesting. Do a three layer design for the use case Produce order fulfillment report. Because you do not have detailed user requirements for this use case, you must first lay out a sample fulfillment report.