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One
Every piece you write should have one point. Whether you are trying to persuade, sell, instruct, or entertain, what is the one thing you want people to get?
Two
The human brain is designed to make choices from two alternatives. Good/bad. Painful/Pleasurable. Happy/Sad.
Use that in your writing. Provide two choices.
Three
The human brain is also designed to regard the number three as complete. Find a way to describe or justify your main point or your favored choice with three vignettes or supporting facts.
Three again
We have three dominant senses, visual, auditory, and kinesthetic. People remember ideas much better when you describe or present them using all three senses. Stories you tell need to involve all three senses.
Four
Four or more items makes something complicated. If you are describing a before condition or something that needs to be changed or some competitive alternative, make it seem complicated.
Five
People can hold five thoughts or facts in active memory. No more than five. Some of those five might be taken up by things that are extraneous to whatever you are describing. Do not present item after item. Give your audience a way to consolidate elements into some more general thought. For example, if you wanted to present six different tips for writing, you might call it Writing by the numbers and give a memory tool like 123345.
If you find this helpful and interesting, there are other helpful and interesting things you can learn from some of the upcoming Edchat Interactive webinars.