"Please stay on the line for an important call."

Link to Pew Research Center report, "New Tricks for Old -- and New -- Dogs:
Challenges and Opportunities Facing Communications Research".

The challenges include:

1. Declining respondent cooperation (from 72% in 1979 to 60% in 1996 to 48% in 2003).

2. Growing number of wireless households. (20% of total.)

3. Young respondents disappearing from landline sample. (See 2nd graph in article.)