We've all seen them, haven't we? Those charts that, instead of illuminating, leave us scratching our heads. They promise clarity but deliver confusion, a visual roadblock rather than a helpful signpost. These aren't just poorly designed; they're what we might call 'bad charts,' and they're surprisingly common.
Think about it. The whole point of a chart is to make data digestible, to let us see patterns and trends at a glance. Good charts do this beautifully, transforming dry numbers into something intuitive. But then there are the others. The ones that use pictorial symbols in a way that distorts the message. I recall seeing one once that used wine glasses to represent gallons of wine sold over time. While visually interesting, the size of the glasses didn't accurately reflect the actual quantities, and the spacing between them made it look like the time periods were equal, completely obscuring the real growth trend. It was a classic case of a 'bad' chart failing to present data clearly and undistorted.
It's not just about aesthetics, though. Sometimes, the issue is trying to cram too much information into a single visual. The guidance for chart designers often emphasizes asking yourself: 'What is the message?' If you can't articulate it simply, or if you're trying to tell multiple stories at once, you're probably heading for a 'bad chart' territory. The goal is to simplify, to break down complex information, not to create a visual puzzle.
Choosing the right chart type is also crucial. Are you trying to show distribution, a time series, a ranking, or a part-to-whole relationship? Each of these has specific chart types that work best. Using a pie chart for a complex part-to-whole scenario, for instance, can quickly become unreadable. Or trying to show a trend over time with a bar chart that's too busy. It's about matching the visual tool to the statistical story you're trying to tell.
And then there's the often-overlooked aspect of accessibility. In today's digital world, especially for public sector websites, charts need to be accessible to everyone. This means adhering to accessibility legislation, ensuring that the information isn't lost to someone using assistive technologies. A chart that's visually confusing for one person is likely to be even more so for another with different needs. This can lead to complaints, reputational damage, and a loss of public trust – all consequences of not getting the visualization right.
So, what makes a chart 'bad'? It's when it obscures rather than clarifies, distorts rather than represents accurately, and fails to communicate its intended message effectively. It's a missed opportunity to connect with your audience and a potential source of misunderstanding. The next time you're looking at a chart, or designing one, take a moment. Does it help you understand, or does it make you wonder what on earth it's trying to say?
