Any good presentation will be a combination of interesting information and arresting graphics. Graphics aid in concentration, comprehension and retention. The better they are, the more likely the message being communicated will be understood and remembered.

In the many presentations I have made over the years, I seldom counted on delivery alone to ensure that the information I offered up would have the desired impact. I was just not that good. So, I liked to use props, and the best and most readily available props are invariably the graphics by which the information is being conveyed.

There are basic rules for infographics, be they in a PowerPoint presentation, in a printed document or on screen.

1. Each graphic should make one point. Which means that if there is no point, don’t have a graphic. (Actually, if there is no point, don’t do a presentation at all.) The corollary is that if you want to make several points, then use several graphics. Layering can work, if your points are sequential and if the layering is handled delicately and judiciously. It’s a dangerous practice, however, that should be attempted only by the most adept.

2. The graphic itself should be obvious. Obvious doesn’t mean plain. It doesn’t mean boring. It does mean clearly understandable. Whether you are showing market share, population densities, product life cycle stages, elevations or critical paths, the viewers’ or readers’ eyes should know instantly where to focus.

3. If you have devices like legends, eyes are forced to hop from place to place just to have a reference point. Legends are not helpful. They cause clutter. They cause confusion. They should be avoided. Graphics where the legend is built into the concept are most effective.

If you are looking for a really great website on infographics, check out infographicsblog.com. It showcases some of the finest – and, sometimes, the less than finest – infographic work being done, saluting innovation and creativity as well as the ability to educate and impress. For each example, the author explains what works well, what doesn’t, and what essential element is missing that might, if present, have put the illustration over the top.

One of my favourite, if slightly flawed, graphics from this blog shows the evolution of Crayola crayon colours over time (100+ years). The kid in you has got to love it, though the ability to have the colour name pop up as your mouse rolls over each colour strip would have been a wonderful touch.

A particularly troublesome illustration tries to present the 10 best places to buy a house in America. Focusing on small cities, it looks at such factors as median family income, average property tax, the number of universities and museums within 30 miles, the number of librairies and movie theatres within 15 miles, the number of sunny days per year, as well as unemployment levels. It uses a variety of charting tools, several overlapping X and Y axes, and a map where the cities are identified by numbers for which you must refer to a legend. I would challenge anyone to actually identify, at a glance, which city would top the chart. Actually, I would bet that, given 10 minutes to study the graphic closely, most people would still be hard pressed to choose. It is one of those well-intentioned if ill-conceived graphics laden with data but light on useful information.

Spend some time at the site. It is as much fun as it is enlightening.