• A bank is planning its requirements for ATMs (automated teller machines) in a new branch. There are spaces for up to six ATMs, not all of which have to be used.
• Three types of ATM can be purchased: general ATMs (giving cash, balances, mini statements and PIN change facilities), ATMs for paying money into accounts and ATMs that provide full account statements.
• The bank has a policy that customers should not wait for more than 5 minutes in the majority of cases (generally interpreted as 99%).
• Develop a conceptual model for this problem outlining the objectives, experimental factors and responses, model scope and level of detail, and assumptions and simplifications.