ENA6 - Investigating Attitudes to Offensive Language

OK, so no takers for the last one on Language Change, so how about this one?

How would you go about investigating people's attitudes to offensive language?

I'm after a 5 point answer using this structure:

• AIM/ANGLE
• METHOD of DATA COLLECTION
• FRAMEWORK for ANALYSING YOUR DATA
• CONSIDERATION of EXTRA LINGUISTIC VARIABLES/ VALIDITY/ ETHICS
• WHAT YOU EXPECT to FIND

...and it's completely up to you what you define as "offensive language"; in fact, that's part of what might make your answer a good one. The usual bag of Haribo goes to the best answer.