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One of the great challenges for board directors and executive leaders concerns written expression. How might one cast vision, report progress clearly, make a request unambiguously, or argue a point convincingly if the key messages are not clearly stated? Directors and executives owe a duty to their colleagues in this matter, for written reports are the primary vehicle for sharing ideas, proposals and data before each board meeting. 
To suggest the quality of the report (especially, the clarity of the message within) may be the difference between success and failure (that is, acceptance or rejection) is, probably, a truism. ​So, if we are to be convincing in our argumentation, we need to write well. But how?
The first thing to acknowledge is that writing is a craft. And, as with any other craft, proficiency is something that emerges over time, as principles are learnt and applied in practice. Look to others who write well, and glean from them. Seek feedback from your readers too, and make adjustments. 
I have long relied on the guidance of William Zinsser (1922–2015), especially that offered in On writing well​. Another great source is the Blue Book of Grammar and Punctuation, which provides specific instructions. How do you ensure board reports and business proposals are well written, and what tools and approaches do you use?