This is just going to open it up to abuse. Most of this 'research' is not in any way academic or 'well structured' and would be regarded by most people as telemarketing. It's basically where they call you up and ask you if you are interested in their products. They could get away with the longitudinal issue by phasing it out over a few years.

Research calls to be allowed on Sundays

http://www.smh.com.au/news/National/Research-calls-to-be-allowed-on-Sundays/2007/05/30/1180205327068.html

The communications watchdog will permit social and market researchers to ring people who signed the national "do not call" register on Sundays.

The Australian Communications and Media Authority (ACMA) announced it had decided to vary restrictions on research calls to allow them to take place between 9am and 5pm on Sundays.

Research calls were already permitted between 9am and 8.30pm on weekdays and between 9am and 5pm on Saturdays.

"ACMA has decided to vary the industry standard because the authority reached the conclusion that prohibiting research calls on a Sunday could potentially reduce the benefits to the community from well-structured research," authority chairman Chris Chapman said in a statement.

"This view is based on strong evidence provided to ACMA that the prohibition could undermine the value of longitudinal data sets where data had previously been collected on Sundays, as well as increase the potential for bias because samples were not representative."