TV Networks Say DVRs and Weak Shows Explain Low Ratings If you ask several of the top programmers in network television what is going wrong with their ratings this season, they offer a litany of answers: jarring schedule disruptions from debates, election night and Hurricane Sandy, for instance, as well as the ever-increasing defections toward delayed viewing and away from the nightly schedules that have defined network prime time since the days of radio. The numbers tell the tale. With seven days of delayed viewing factored in, ABC is down 7 percent in the audience preferred by most advertisers, viewers between the ages of 18 and 49; CBS is down 18 percent; and Fox Broadcasting is down an eye-popping 26 percent. NBC is the only network bucking the trend, with its audience up 23 percent in that category. "We are definitely in a transition period," said Paul Lee, president of ABC's entertainment group, citing the heavy shift toward reliance on DVRs and video on demand to create personalized viewing schedules. Another factor also seems to have been at work this fall: disappointing new shows. "The point the networks make is that the DVR is revolutionizing viewing," said Brad Adgate, director of research for Horizon Media, a media buying company. But that is masking the fact that the new shows they put on this fall just aren't that good. There are better shows on cable. The lack of excitement this fall came in stark contrast to a year ago, when a host of new series broke through as hits: "Two Broke Girls" on CBS, "New Girl" on Fox, "Once Upon a Time" on ABC and many others. ABC had an especially fruitful year, bringing back six new series for second seasons. This season, only one new series, the NBC drama "Revolution," has cracked the top 30 programs among those 18-to-49 viewers. Mr. Lee noted that "there is always an ebb and flow" to seasons, with one marked by strong newcomers followed by another filled with misses, and midyear shows that often reverse the fall trend. Kevin Reilly, chairman of entertainment for Fox, also stressed that the history of television has been marked by what he called "flat years" when the new selections largely didn't pan out. "I think this is a flat year," he said. Another top network executive, Kelly Kahl, the chief scheduler for CBS, suggested that the season may be showing signs of settling down after the disruptions of the fall, citing stabilized performances for CBS's shows in recent weeks. But he, too, stressed that networks have to recalculate the meaning of success with "people adjusting to new ways of watching television." He pointed to CBS's growing success in adding viewers from DVR recording, with no fewer than eight CBS shows adding more than three million viewers after a week of delayed viewing is counted. Only one of those, the drama "Elementary," is a new show. A few new shows gained favorable reviews but failed to attract adoring audiences. ABC's "Nashville," despite strong critical backing, has struggled to build wide audiences, winning support among young women but not with older viewers - perhaps, Mr. Lee said, because older viewers "have not gotten past the barrier of country music." A Fox comedy, "The Mindy Project," won critical praise, but has ratings that, in most recent years, would have doomed it in two weeks. But it at least has a core audience of young women watching, and as with "Nashville," in this season's environment, that has been enough for survival. "Usually you are able to say the show was sampled and rejected," Mr. Reilly said. Almost none of these new shows were even sampled. The need to find some way to carve out space on viewers" recording machines has been an added factor preoccupying the programmers" minds. "There is a real pressure to make sure this is appointment television," Mr. Lee said, "television that has a hook." Robert Greenblatt, the top entertainment executive at NBC, reinforced that point. "The bigger the hook the better," he said. But Mr. Lee said this approach could be contradictory. "On the one hand," he said, "you need it to have the fierce urgency of now, so you want to watch it live. But on the other hand, you want it to be attractive enough for people to want to put it on their DVRs.