I've prepared a few slide-decks for an in-house Galaxy tool-development workshop, available at https://github.com/Public-Health-Bioinformatics/galaxy-tool-tutorials in pdf and libre office odp format. I thought others might appreciate them or have feedback. I see now the https://planemo.readthedocs.org/en/latest/writing_standalone.html tutorial which will be a good resource for us too! In the "Galaxy tool Versioning" deck devoted to making people aware of what versioning means for tools, I said: "An update: a cosmetic change or functional enhancement that doesn't affect the previous output behaviour of the tool. (This can also include bug fixes that remedy previously useless output.) A revision: a functional enhancement that changes the current output of the tool, or marks significant enhancements." So is that agreeable? I was trying to get at the fact that Galaxy will let you upload code changes without necessarily incrementing the tool's version #, so thinking of the allowable cases for that "update" situation. Damion Hsiao lab, BC Public Health Microbiology & Reference Laboratory, BC Centre for Disease Control 655 West 12th Avenue, Vancouver, British Columbia, V5Z 4R4 Canada