Practice, Practice, Practice. Conduct at least one fire drill and one emergency drill per month. Discuss problems and possible solutions after drill is complete.
Establish a crisis management team that consistently meets in the physical and virtual worlds to discuss school safety procedures and best practices. For example, leverage the power of Google Classroom, Google Drive, and Flipgrid to share, document, and communicate.
Ensure essential personnel are outfitted with two way radios. Another option would be to use a walkie talkie app called Voxer.
Keep all classroom and office doors locked. The Sandy Hook Report mentions the fact that there has never been an active shooter that has been able to enter locked classroom and harm people. Just make sure you are able to lock/unlock from the inside.
Consider installing strobe lights in high traffic/noise areas inside and outside of school that will alert students, staff, and visitors during a drill or actual emergency situation.
Wear identification badges at all times. Yes of course people that you work know who you are, but more often than not, first responders have no idea who you are.
Purchase lockdown kits that can be utilized in the event of a situation that last s for several hours. These kits often contain medical supplies, food, and water. Plus the bucket can be used as a makeshift bathroom.
Use Share911 to communicate with staff and first responders during a drill or actual situation. This web application can be added to your mobile device and streamline communication during a crisis. Key features include sending out mass alerts, checking in, all clear, and ppsting whereabouts of students and staff.