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In a bank huge and complex Excel spreadsheets are used by traders to calculate the risk-per-book for structured financial products. The Excel spreadsheets do not calculate itself the risk, but are used as front-end for calculations done by server-based Monte-Carlo simulations. Due to audit requirements, the risk calculations must run additionally in a "controlled and automated environment" without user interaction. The calculation framework and the Excel spreadsheets are constantly enhanced by the quantitative analysts from the trading department. This leads to the necessity of a constant update of the "controlled and automated environment".