How Canada counts its viewers.(television viewers)

TV markets around the world are undergoing the most rapid technological changes in decades. Digital video recorders, recordable DVD players, HDTV receivers and TVs, cellphone TVs, flat plasma and LCD TVs have served to strain traditional measurement techniques.

Those tasked with providing reliable audience measurement face unprecedented challenges. BBM, the research firm that measures radio and television audiences in Canada, has spent years researching solutions for the changing media environment.

As the company's former VP of research, I have direct experi