Sisters is a television drama which aired on NBC for six seasons, from 1991 to 1996. The series was created by Ron Cowen and Daniel Lipman, who were also the executive producers and showrunners. The show debuted on May 11, 1991 for a seven-episode test run and was subsequently renewed for the 1991 fall schedule. Sisters was the first primetime network television series to focus specifically on the lives of women, and the issues relating to them. It was also one of the first 'demographic' hits because of its strong female viewership. Other series about women would eventually follow, but at the time it was regarded as being groundbreaking.