Wow, L.O.C.K... you asked something very interesting and brought up some very interesting points (even some NPHC members may not really even notice it...)
But to answer your question... every organization is different and they have their own rules pertaining to when they do intake. I know at some HBCU's all groups do intake at the same time in one semester (according to the schools, it makes it easier to keep track...)
At my school, which is a PWI, all except one will attempt to do intake every semester if there are interest doing that particular semester. Or if there is interest in the fall and many would know there is interest in the spring, some would just wait to bring through a "big line"...
It is just up to the indiviual chapters unless their IHQ gives a mandate or something...
