1. Introduction
Big stone is hard to throw.
—German proverb
Imagine you have to develop an application that will support traders in the front office of a financial institution. The traders have to be able to buy and sell products and calculate the risk of each transaction. One major difficulty is that the products available for trading are constantly changing. If you focus on the options market, you will see that almost every other day, a new product (option) is available for trade, traded differently than the others, and whose underlying risk must also be treated differently. Therefore, if you ask your client for the system requirements today, you will probably get a different answer than if you were to ask her tomorrow. Furthermore, she will ...
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