Organizations are increasingly looking for ways to derive more business value from their IT investments. A popular approach is to achieve this value through building an organization’s IT capability. In the current fast-changing business environment organizations need to anticipate and respond to shifting opportunities. A well-developed IT capability provides a stable platform on which to enhance competitive advantage or, within the public or voluntary sector, to facilitate the delivery of cost effective and high quality services. In this briefing we explore the lessons learned by 10 large organizations through undertaking one or more IT maturity assessments between 2010 and 2015 using the IT Capability Maturity Framework’s (IT-CMF) Executive Assessment (EA) tool. We further examine their experience and their success in building their organizational capabilities.