Next: Observational Data Previous: Rotation Periods of PMS Stars . ... 1993,1995; Grankin 1993, 1994; Prosser 1993, 1994, 1995; Adams 1995; Choi & Herbst 1996) cover a wide range of stellar ages, but with exception of the ONC, the nTTs have been underrepresented. ... Because some nTTs may have very recently lost their disks, they could be stars undergoing rapid change in their rotational properties. ... 1996). In this dissertation, I will discuss the results of observations of nTTs in Orion. ...