Reading Usable Help
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Gordon R. Meyer
Shifting trends in reading behavior
The folks who make Read It Later, a service that lets you save webpages for later use, write about the trends they're seeing in Is Mobile Affecting When We Read?.
It's interesting that finding and locating information seems to take place at certain times, while reading occurs more often during another. Without any data about the types of reading material being saved, it's hard to precisely apply this to instructional material, but you might ask yourself how you can better serve these types of users.