Planned Systems International (PSI) is a leading enterprise IT solutions provider specializing in Health IT & Data Integration & Analyses. But we're a lot more. PSI's Andover Headquarters are located in a 68, sq. ft. office and laboratory complex in the metropolitan Boston area. The area is home to some of the. Map of all Population Services International offices (under construction). More information, including full addresses, is available on www. strukljeva.net.