Roosevelt High School in Portland, Oregon. The Portland Public Schools district is among the first members of K12 SIX. (Visitor7, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons)
The automotive sector has its own Information Sharing & Analysis Center (ISAC). So do the aviation and maritime industries. They all represent forms of transportation, but no one would say they all face the exact same cyber threat scenarios.
So why have K-12 schools traditionally been lumped in with the public sector and higher education when it comes to ISAC activity? Local education districts have their own distinct challenges as they strive to protect themselves against digital threats. It only makes sense that they have an ISAC of their own.