This document outlines the implementation of Clarity as a project portfolio management (PPM) tool at Sony Ericsson from 2005 to 2009, detailing the selection, scope changes, and phases of deployment. Key challenges discussed include managing change resistance, defining core processes, and ensuring user buy-in through education and communication. The document emphasizes the importance of an agile approach, active stakeholder involvement, and the need for ongoing support to achieve a successful transition to the new system.