Students have plenty of prior knowledge about how to survey well, they just aren’t necessarily aware of it.  For the most part, students can intuitively identify problems with surveys.  Often, good sampling and survey methods are really just good common sense.  We gave students three different examples of surveys that all had something wrong.  Students discussed in their groups what the issues were and what impact it would have on the results.  After the groups, have worked through the activity, go back through and add the proper vocabulary.  For example, students should identify that conducting a survey via landline phone calls is problematic, this is an example of undercoverage.