Best practices in business communications occur both on the level of corporate policy and of individual performance.
On a policy level, best practices include transparency, accessibility, and openness. All people in an organization are most productive if management and workers all are on the same page.
On an individual level, it is important to be clear and unambiguous. Conciseness is also important. As most people do not read beyond the first page of a document, it is crucial to put the important information or bottom line first, and then follow with amplifying details. Avoid excessive verbiage, statements of the obvious, and unneeded broadcast messages as they waste people's time.