Scrum+Evo practices are compatible with Scrum. In reality, we practically implement Scrum, but not in full. Though every aspect of Scrum is followed, at some point Scrum does not specifically discuss the specification methods, and thus the Evo’s Planguage is used.
What is Evo? Evo is the short form of Evolutionary Value Delivery, which was created by the creators of Agile Manifesto. During 1960s, Evo was intuitively used as a main project method. Evo was then and now used with a purpose to deliver tangible results to the stakeholders. Evo is merely a specialized variant of the powerful PDSA cycle of Deming/ Shewhatt used in 1950s. The key idea behind using Evo is learning and change, not by retrospectives but using hard measured facts such as numeric feedback with values and costs. Evo is focused on delivering measurable multiple value requirements to the customers and stakeholders.
Book: Agile and Iterative Development: A Manager’s Guide by Craig Larman