Indian Railways wants to develop an application for the train ticket reservation system. It facilitates for selecting the train number and name, source, destination and the date of journey. Assume that in each train, there are 300 tickets and every booking should have a unique number. Finally, the tickets will be allotted for the passengers in three categories such as Confirmed, Waiting List and Reservation Against Cancellation (RAC). Propose a suitable design model using top down approach and bottom up approach for the above scenario