Networks consider prime time moves. (television program changes)

O.J. story, expanded playoffs factored into early returns

One month into the new season, ABC and CBS already are making moves to strengthen their schedules, while NBC and Fox contemplate following suit.

One factor all the network programers are considering is the somewhat atypical start to the season. So far they have seen major news stories (most notably the O.J. Simpson trial) cut into prime time, as well as the first-ever expanded playoffs for baseball.

Another factor is the sheer volume of new shows 42 in all--on the four networks. Although some observers have suggested that all of the new shows have been hurt by the feeding frenzy, others say the …