Any framing of communications has its difficulties as Joyce has already identified and framing communication policy thus raises aspects of censorship. So any research you undertake, whether it be qualitative or quantitative has to address three requirements that are that the means of communication are affordable, that they are accessible and that they are available. So unless the policy can guarantee these means then it will undoubtedly fail. I hope this helps. All the best.
While agreeing with Joyce and Guy, I suggest also, that qualitative research could be used to explore if that communicated is understood as intended.
For instance, in my field of addiction studies, there have been instances where researchers have piloted the neutral term Problematic Drug User (PDU) and found this poorly understood; thus, they have had to resort to fielding the more pejorative but more generally understood term of 'Drug Addict'.
This has implications for framing Communications Policy.