This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
As per workshop out they say there are some systems are read only (None of the three systems will be written to) but in use cases user attaches the information those will be inserted to these systems which seems contradictory. Should I consider that the external system will have read and write only but cannot be updated?