Twenty-first century private security will involve the extensive use of technology to protect people and property. By the end of the first quarter of the next century, for the more important areas, perimeter protection will include in its arsenal invisible force fields that preclude entry of all unidentified persons. These fields will protect large outside areas and meet special indoor protective needs. Most security systems will be completely integrated to include access control; fire, personnel, and property protection; as well as protection of computer technology hardware, software, and the information it contains. Robots and microbots will be the most visible security protectors. Human security personnel must have the educational background and training necessary to prepare them to maintain and manage the highly technical and sophisticated protective security systems of the 21st century. 42 references