I built a political survey app once, and we started out using sliders to measure both (1) issue importance and (2) agree/disagree. It was way too fiddly, and no one cared about degree of accuracy. Every iteration of the UI we gave the user fewer choices. By the end I was pushing for just "agree" and "disagree" or even "agree" and "next question," but we never took it quite that far.
I built a political survey app once, and we started out using sliders to measure both (1) issue importance and (2) agree/disagree. It was way too fiddly, and no one cared about degree of accuracy. Every iteration of the UI we gave the user fewer choices. By the end I was pushing for just "agree" and "disagree" or even "agree" and "next question," but we never took it quite that far.