Should viewers who watch TV only on smartphones or tablets be counted as TV households in Nielsen ratings? "That's a question at the heart of a complicated decision Nielsen hopes to make by the end of the first quarter regarding a new definition for what constitutes a TV household," writes Andrew Wallenstein. "Nielsen is said to favor an approach staggered in stages, say sources, the first of which would be ready for the 2013-14 TV season incorporating broadband-connected TV sets -- but not include measurement of video consumption on wireless devices."