Skimming has a hidden cost

Picture this. You’re dealing with a team issue. You have an idea of what to do, but would like your manager’s guidance. She’s always busy, and your regular catchup isn’t until the end of the week. So you write to her. Respecting her time, you keep it short. You give the topic and the context. You list two options, saying which seems better. And you mention another option that wouldn’t work. You ask whether your manager agrees. You know she’s handled stuff like this before. Signing off, you check the word count. 100 words. The same length as this paragraph.
She writes back at the end of the day. She asks whether you’ve thought about another option. But it’s the same option you rejected. She skipped that bit. You write back to explain, and wait another day for an answer. She writes back, apologizing, and pointing out some useful info. All good, but you both wasted some time — time that busy people can’t afford to lose.
You’ve probably been in that writer’s shoes, frustrated at being misunderstood. But if we’re honest with ourselves, we’ve been in that manager’s shoes too. We’ve read too quickly and missed some important detail. It might not seem a big deal, but over time, that wasted time and frustration can mount up.
We all skim
Reading online information, we all skim, a lot of the time. In a survey by the authors of the book “Writing for Busy Readers”¹, respondents reported skimming nearly 40% of their emails and 20% of their text messages. But that seems optimistic. (Self-reported data often is.)
To a survey by Ziming Liu², 80% of respondents reported that they spend more time on “browsing and scanning” than they used to, and a similar percentage do more “non-linear reading”.
In “Reader, Come Home”³, scholar Maryanne Wolf summarized research on reading behavior, finding that:
…digital reading often as not involves an F or zigzag style in which we rapidly ‘word-spot’ through a text (often on the left-hand side of the screen) to grasp the context, dart to the conclusions at the end, and, only if warranted, return to the body of the text to cherry-pick supporting details.”
Does this skimming behavior mean that we are able to understand what we read in less time? Perhaps not. Often, we think we have understood more than we actually understood.
Research showing how we over-estimate our reading comprehension
Research on privacy policies by The Behavioral Insights Team found that there was a weak or virtually nil correlation between perceived comprehension and actual comprehension: “Improving consumer comprehension of online contractual terms and privacy policies

