  This paper adopts a critical approach to ChatGPT, showing how its huge reach
makes it a useful tool for people with simple requirements but a bad, even
misleading guide to those with more complex problems which are more rarely
present in the training data and even more rarely have straightforward
solutions. It works through four exercises in creating lookup formulas using
chatbots, showing the need to test the offered solutions. They are a simple
lookup, a lookup to the left, a match of two values at the same time, and
intentionally confusing the models by using common language with technical
meaning in Excel. It concludes with a practical guide for how to add an
Excelscript button, with system and user prompts, to the ChatGPT API into the
Excel desktop environment, supported by a blog post giving the technical
details for those interested.
