Discussions on hardening soft targets like schools you ask? Why yes, here are a few considerations?

I’m not sure there is a total blanket approach. The tools and procedures used in one school based on it’s size, layout, funding, and staff may not work other places. There are a handful of universal thoughts that do apply though…

Those would be:
-Doors that automatically locked when closed.
-Keep doors locked to the outside so entry points are chocked when not manned by the staff.
-Surveillance equipment to be only depended on IF there is somebody actively watching them.
-Natural barriers in front of access points to dissuade vehicles from coming through
-Communication from local LE to school and vice versa on known and suspected issues so the schools have a heightened sense of what to be on the lookout for
-Perimeter fencing/lighting
-Enhanced standards for lighting, guards, and identification
-Volunteer or increased security presence during large events (football games, school programs, etc.)
-Reduction of red tape in order to hire armed security
-One-Way traffic control during large events (helps a free flow of people in and out in a hurry)
-Anonymous tip-texting numbers (this can be achieved for free with a Google Voice number that can be monitored from multiple access points)
-Social Media Monitoring
-Facility Floor Mapping program (crowd sourced solutions)
-Mass notifications via text, alert, app, etc.
-Routine A.L.I.C.E. training – annually
-Sheepdog Training – Annually
-List of local Sheepdogs with Firearms Training (starts usually with LE, Retired LE, Military Service, Firearms Trainers, Competitive Shooters, Self Defense Instructors/Students, etc.) and provide them permission to carry on school premises as School Sheepdogs
-Present Danger drills for the schools
-Present Danger drills for local support (fire, ems, law enforcement responses, etc.)
-Security Assessment Evaluations and consulting (NRA School Shield Program)
-Each teacher armed with pepper spray (ON their person at all times)
-Each classroom upfitted with tools like pepper spray, emergency call buttons, and defensive tools to a “Present Danger” event
-Strategically placed first aid including tourniquets, mass casualty care, and plenty of things to slow/stop leaks (most people will need that kind of care rather than being heavy on burn responses, plus many schools are fallout shelters for natural disasters like tornadoes, so think about multiple uses for your first aid)

Additional considerations:
-Metal detectors
-Panic Button systems
-SMS opt in systems (attendees of a school or program can text to opt-in to an event communication blanket)
-Volunteer response teams
-Community Curriculum (classes as prerequisites for students and free for locals in self-defense, situational awareness, risk assessment, etc.)
-Lowering School bond requirements a few percentage points solely for the purposes of adding hardening of soft school targets infrastructure

Of course I wouldn’t limit the responses to those above, but there are a few there to get the creative juices flowing. All in the first list should be implemented. I know some of those appear to be very foreign concepts depending on where you live and where you’re from. However, there are over a dozen states that are essentially doing all of them in some fashion and they know while it doesn’t preclude the horrible from ever happening, it drastically reduces the likelihood. Utah is a perfect example. They have schools the really have taken this initiative and run with it and there’s a feeling of safety and security among them. They have simply said, flat out, “We’re not going to be victims. We have implemented and trained on active and passive methods of security, and we’re ahead of the curve.” I know they’re right, even if some of these things are hard for you to comprehend…