The current presentation presents the Harmonized Methodology that has been developed in the context of ACCESSIBLE project in order to link critical accessibility components. ACCESSIBLE “Accessibility Assessment Simulation Environment for New Applications Design and Development” is a three year STREP Project of the 7th EU Framework Programme for Research and Technological Development (FP7), that aims to define an overall European Assessment Simulation Environment making extensive use of the latest available IT technologies and concepts. Upon the basis of an overall harmonized design and structure, the developed methodology will evolve all types of disabilities that are targeted in the project, the ICF classification, the interaction limitations of these disabilities, the assistive technologies used and the respective guidelines in each ACCESSIBLE area (web applications, mobile applications, web services and Description languages) and will correlate them in such a way that any user can navigate among them in an easy and seamless way.