Based on the ArchiMate 3 documents or objectives, a capability represents an ability that an active structure element, such as an organization, person, or system, possesses. An outcome represents an end result that has been achieved. A realization relationship indicates that an entity plays a critical role in the creation, achievement, sustenance, or operation of a more abstract entity. The diagram uses a realization relationship from the Digital customer management capability to the Excellent online customer interaction outcome to indicate that the capability realizes the outcome.
References: ArchiMate 3.2 Specification, Chapter 7 Strategy Elements, Section 7.2 Structure Elements 1; ArchiMate 3.2 Specification, Chapter 5 Relationships, Section 5.1 Structural Relationships 1; Capability Map: Artifact of Vision Phase - Visual Paradigm Guides 2.