\section{Acknowledgements}

A long time ago Dieter Hammer send me a presentation explaining the SMART
acronym. A vivid discussion with Thomas Gilb triggered this presentation,
because I kept struggling with the need for being specific and measurable at
the one hand, and the need to understand the less tangible aspects at the
other hand. I thank them for their inspiration.

Tom Gilb and Lindsey Brodie helped me to trace back the origin of SMART.
