There are many maturity models in the Enterprise Architecture field today. Each maturity rating system provides an infrastructure and criteria to determine an organization's maturity. The three most prominent models to consider are established by three different organizations, have different focuses, and provide different levels of agility and maturity level expectations. These three models are provided by the General Accounting Office (GAO), the Gartner Group, and the National Association of Chief Information Officers (NASCIO). Each evaluation structure is different and so are the different criteria to achieve the maturity level rating.