The role of library media specialists in teachers' utilization of instructional television (ITV) in Maryland schools was examined, using data from the earlier Maryland ITV study (1982), which used separate questionnaires for principals, library media specialists, and five randomly chosen teachers from each of 200 schools. The current study appended compressed data from the principal and library media specialist to 592 teachers' records, in effect, regarding the characteristics of a teacher's principal and media specialist as environmental attributes. Teachers' ITV use was largely explained by their past and present disposition towards the medium. Although data from principals accounted for far more variance than data from media specialists, when combined with information from teachers, principals' characteristics added no new information, while media specialists' attitudes and practices did covary with teacher use of ITV. Less experienced teachers used slightly more ITV, and training in ITV utilization did not affect frequency of use. It was concluded that teachers should be introduced to a few positive experiences with ITV using an approach geared to integration of ITV with daily teaching, and that the media specialist's role as change agent and consciousness-raiser should not be underestimated. Four references are listed. (LMM)