A recent post on RWW (Best Practices For Writing For Online Readers [sic - crappy title!] ) offers some interesting models for testing. The first interesting idea is Dale's Cone of Experience:
This model stresses involving readers in engaging activities rather than simply reading words on screen. Thus blog posts accompanied by memorable images should theoretically be more memorable than text only posts, and building a culture where readers engage in commenting through the use of prompts and open questions in posts should drive deeper understanding than reading alone.
The second interesting idea is the 3-2-1 formula - for every 1000 words you write online, use:
- Three subheadings
- Two links
- One image