This document provides information about IBM Security Identity Manager (ISIM) implementation at ATP, the largest pension fund in Denmark. Some key points: - ATP implemented ISIM in 2005 to automate user lifecycle management across multiple systems like SAP, Windows AD, and others. - ISIM manages over 14,000 user accounts across 33 systems. It automates processes like onboarding/offboarding via HR feed and manages roles/policies. - A key project involved onboarding 1,500 new users from municipalities onto ATP systems to centralize welfare payments. This increased the number of managed systems and roles in ISIM. - ATP has customized ISIM over the years to suit their needs,