This study by Nielsen Nelson literally changed how I see the world when it came out.
From its own summary: "Across 33 rich countries, only 5% of the population has high computer-related abilities, and only a third of people can complete medium-complexity tasks."
When you read what they consider medium-complexity tasks, you will probably head desk. But this is the computer skill level of the general population. When you make applications, you have to consider these are your users, and you need to accommodate them. Which also leads me to why I feel this study needs a follow up. After around 10 years of improving UX since this study started we have seen a significant increase of usability, but I believe a lot of other computer skills have atrophied in its wake. In that time, we built out an infrastructure around simplifying computer use for the average person, and I believe we are now victims of our own success. What a lot of us consider basic computer skills has been seen as black magic by the general public for years.
At my alma mater, they are calling for the state to bring back typing classes because kids don't know how to use a file path, or sometimes they never learned how to type. PCGamer had a similar piece about this a couple years ago. Part of this is the shift to mobile and tablets, and it's not entirely a bad thing. In a lot of cases we have created expert photoshop users who don't know where their photos are saved to, and they frankly don't care. They are complacent in their walled garden app store and are comfortable. I just hope the search function doesn't get bugged on them one day, cause that will cause a lot of chaos for them.
