Structure: write with a top-down approach
Employ the six basic writing structures
Keep like things together
Style: support what you say
Always use parallel forms
Capitalize on sentence variety
Choose an appropriate tone
Readability: capitalize on layout and design
Consider using headings and headlines
Keep your writing gender neutral
Go back and rework your writing
Grammar: 30 rules of grammar
Using correct grammatical idioms
A few highlights on correct punctuation.