  The wealth of functionality in the Excel software package means it can go
beyond use as a static evaluator of predefined cell formulae, to be used
actively in manipulating and transforming data. Due to human error it is
impossible to ensure a process like this is always error free, and frequently
the sequence of actions is recorded only in the operator's head. If done
regularly by highly paid staff it will be expensive. This paper applies to
those spreadsheets which involve significant operator intervention, describes a
method that has been used to improve reliability and efficiency, and reports on
how it has worked in practice.
