  The use of spreadsheets is widespread. Be it in business, finance,
engineering or other areas, spreadsheets are created for their flexibility and
ease to quickly model a problem. Very often they evolve from simple prototypes
to implementations of crucial business logic. Spreadsheets that play a crucial
role in an organization will naturally have a long lifespan and will be
maintained and evolved by several people. Therefore, it is important not only
to look at their reliability, i.e., how well is the intended functionality
implemented, but also at their maintainability, i.e., how easy it is to
diagnose a spreadsheet for deficiencies and modify it without degrading its
quality. In this position paper we argue for the need to create a model to
estimate the maintainability of a spreadsheet based on (automated) measurement.
We propose to do so by applying a structured methodology that has already shown
its value in the estimation of maintainability of software products. We also
argue for the creation of a curated, community-contributed repository of
spreadsheets.
