I came across the following bar chart (link), which presents the results of a survey of CMOs (Chief Marketing Officers) on their attitudes toward data analytics.
Responses are tabulated to the question about the most significant hurdle(s) against the increasing use of data and analytics for marketing.
Eleven answers were presented, in addition to the catchall "Other" response. I'm unable to divine the rule used by the designer to sequence the responses.
It's not in order of significance, the most obvious choice. It's not alphabetical, either.
I think this indiscretion is partially redeemed by the use of color shades. The darkest blue shade points our eyes to the most significant hurdle - lack of investment in technology (44% of respondents). The second most significant hurdle is "availability of credible tools for measuring effectiveness" (31%), and that too is in dark blue.
Now what? The third most popular answer has 30% of the respondents, but it's shown by the second palest blue! I then realize the colors don't actually convey any information. Five shades of blue were selected, and they are laid out from top to bottom, from palest to darkest, in a sequential, recursive manner.
This chart is wild. Notice how the heights of the bars are variable. It seems that some bars have been widened to accommodate wrapped lines of text. These small edits introduce visual distortion so that the areas of these bars no longer are proportional to the data.
I like a pair of design decisions. Not showing decimal places and appending the % sign on each bar label is good. They also extend the horizontal axis to 100%. This shows what proportion of the respondents selected any particular answer - we note that a respondent is allowed to select more than one response.
The following is a more standard way of making a bar chart. (The color shading is not necessary.)
This example proves that the V corner of the Trifecta Checkup is still relevant. After one develops a good question, collects useful data and selects a standard chart form, figuring out how to visually display the information is not as easy breezy as one might think.