As of February 2015, there are 27 out of 36 shows in the ABC television lineup that are in nonrenewal status, according to Renew Cancel TV. This indicates that, although the network has not cancelled the show, it has not renewed or ordered subsequent seasons yet.
Television networks generally wait until the conclusion of a season to determine whether to renew. Factors in this decision typically include the cost and ratings of the show. Although a television program may not garner weak enough ratings for the network to outright cancel it, a nonrenewal indicates that the television show hasn't earned sufficient interest to continue being produced.
As an exception to this, the ABC shows "Black-ish," "Castle," "Cristela," "Dancing With the Stars," "Forever," and "How To Get Away With Murder," for example, have noncancelled statuses other than nonrenewal. The shows listed have either had another season of production ordered, indicating renewal, or, as with "Dancing With the Stars," begin a new season soon.
Beyond nonrenewal status, three ABC shows have already been cancelled by the network: "Manhattan Love Story," "Selfie," and "Members Only," which was cancelled prior to the airing of the series premiere, indicating that the network was not interested in producing the show.