Recently, the NAV Design Patterns team published the C/AL Coding Guidelines that we use at Microsoft Development Center Copenhagen to the Dynamics NAV Community Wiki site. Please join us there if you want to read and discuss the guidelines.
However, we've been asked for a printable version of the guidelines as well, so we attached a PDF file with the current version to this blog post. This PDF file will not be updated if and when the guidelines change, so please consider them a snapshot as of January 2015. For more information, see the Dynamics NAV Community Wiki.
The NAV Design Patterns team