A coffee shop runs a computerised loyalty card system. Customers are issued with a loyalty card with their name together with a unique customer ID. Loyalty points are added to their card each time they spend money at the shop. The following information is stored for each customer: ID, name, home address, email address, mobile phone number, date of birth, number of points, date of last visit and amount of money spent at last visit. A new module will generate a personalised email message to each loyalty card customer who has not visited the coffee shop in the last three months. The message will include a unique voucher code which can be used to authorise a discount if the customer goes to the shop within the next two weeks.