By Donald Yeates; Tony Wakefield
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Extra resources for Systems analysis and design
If we had the opportunity to rework systems produced three, ﬁve, ten years ago, not only would the solutions be very different but so would the problems. • The customer is very important. Make sure that you know the customer, and what kind of solution is needed. • There is no such thing in practice as a perfect system. There are successful systems. Understand the customer’s criteria for a successful system. What will produce that wonderful phrase ‘Well done, you’ve done a good job’? • Systems development is difﬁcult.
Payment recording Payments may be made in various ways: • by cash/cheque at speciﬁed outlets; • by standing order; • by automatic deduction from credit/debit cards; • by direct debit. Payments are made subsequent to bills being issued. The method is recorded for each customer. Number maintenance Numbers are held on the system and are either allocated to customers or available for allocation. New numbers are speciﬁed periodically and set up so that they may be allocated when required. Pricing policy The company has several approaches to pricing and uses a number of tariff plans.
Constructing the batch-processing elements of these new systems has become the new challenge. 3 SSADM The models and techniques used by SSADM ﬁt easily into the structure of the business, data and dynamic models described above: • Dataﬂow diagrams and business activity models show the business view of the system, just as the data structure model is shown with a logical data structure diagram and through the use of normalisation. • Dynamic system behaviour is represented by a number of models, of which the entity life history model is the best recognised.