This issue of "Lessons Learned" addresses "Dealing with Weapons on Campus." Each year, school administrators, faculty and staff must deal with the possibility of students planning and carrying out pranks such as toilet-papering trees, egging automobiles or spray painting school property. These high jinks often occur at the end of the school year, when warmer days and the prospect of summer vacation trigger student restlessness and apathy. On the final day of classes at one middle school, a seventh-grader had smuggled three rifles in a duffel bag to hold the principal hostage for a ransom. An assistant principal, while conducting a sweep of the school, including the restrooms, spied the legs of a student slipping into camouflage clothing while three rifles lay in an open duffel bag on the floor of the closed stall. Based on what he had observed in the restroom, the assistant principal announced a schoolwide lockdown to staff members. Emergency calls from the school that morning had initiated a response protocol from district police and school security staff. The incident at Delaney Middle School points to the importance of emergency management planning, training and practice with first responders, community members, students, school and district staff, and administrators throughout the year. Collaboration is essential--no one agency can successfully manage a school-based emergency alone. Delaney's lessons learned regarding the handling of an end-of-the-school-year emergency should assist schools and school districts nationwide to set priorities, allocate resources, establish protocols and determine accountability criteria for emergency management in schools year-round. [This publication was produced by The Emergency Response and Crisis Management (ERCM) Technical Assistance (TA) Center.]