What steps would you take to ensure that the purpose of your message (whether informative, negative, or persuasive) is conveyed to your readers?

Question

When things are given in an order, humans generally remember the first and last objects in the series better. Mention your purpose in the introduction and the conclusion.

I hope this helps. Thanks for asking.

Although these articles do not deal directly with your question, they have some points that will apply.

http://www.members.cox.net/dagershaw/lol/MessageAcross.html
http://www.members.cox.net/dagershaw/lol/LearningRequire.html

I hope this helps a little more. Thanks for asking.