IT governance and the associated IT organization are often not involved in the growth of a company.
The IT organization needs to be synchronized with the entire organizational structure for agile principles to work.
Scott Ambler and Mark Lines published the book 'Choose Your WoW! A Disciplined Agile Delivery Handbook' which focuses on optimizing the way of working.
A customized approach is necessary to combine the tools from different models and suit the organization's needs.