The survey asked respondents to select their most, second most, and third most problematic items from a list. In giving each selected item a weighting, the following chart shows the overall rating of difficulty and frustration for each item.
In order, the most problematic items are:
CAPTCHA - images presenting text used to verify that you are a human user
Screens or parts of screens that change unexpectedly
Links or buttons that do not make sense
The presence of inaccessible Flash content
Lack of keyboard accessibility
Complex or difficult forms
Images with missing or improper descriptions (alt text)
Missing or improper headings
Too many links or navigation items
Complex data tables
Inaccessible or missing search functionality
Lack of "skip to main content" or "skip navigation" links
CAPTCHA remains the most (by a notable margin) problematic item indicated by respondents. The order and indicated difficulty for the items in this list are largely unchanged over the last 8 years, with one notable exception—"Screens or parts of screens that change unexpectedly". This item has moved from 7th most problematic in 2009 to 5th most problematic in 2012 to 2nd most problematic in 2017. This is likely a result of more complex and dynamic web applications.