Currently, the transition to digital economy opens up new opportunities for business and entrepreneurial activity, but and new challenges as well. Companies are looking for ways to transform digitally, often without sufficient information about digital technologies, as well as without a consistent approach in developing and implementing a digital strategy. Nowadays there are a number of approaches to the digital transformation, based on cross-disciplinary view, but there is an imperative for particular models and tools for digital transformation strategy development. The paper proposes framework, based on Enterprise Architecture, Capability Driven Development approach (CDD), and strategic models. Authors propose using of the developed ontologies and IT-projects portfolio management system architecture for successful digital transformation strategy development and implementation.