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iPython Notebooks are a nice modern example. These notebooks act as code that can be annotated and executed on the web, allowing an interested reader to study and even modify a copy of the underpinning code, without contacting the authors or initiating a long investigation. [iPython example from Hope's figure]  ## Links to Software  By combining tools discussed elsewhere in this document, once can "mint" digital object identifiers that point to a particular version of software, assuming it is stored in an organized repostitory. One example is given here: https://guides.github.com/activities/citable-code/, on a web page that shows how to mint a citable DOI for code using the [GitHub](http://github.com) and [Zenodo] (http://zenodo.org) services together.