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A UseCase specifies a set of actions performed by its subjects, which yields an observable result that is of value for one or more Actors or other stakeholders of each subject.

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Figure D.5 - Establishing Top Level Use Cases for the Hybrid SUV
Figure D.6 - Establishing Operational Use Cases for Drive the Vehicle
Visual containment of the symbol for a UseCase in the rectangular symbol for a subject Classifier does NOT imply ownership! Packaging (ownership) of UseCases is separate from use within subjects, and a single UseCase may be used in more than one subject.
Webel: SysML for MBSE: The frequent recommendation that each UseCase have at least one "primary" scenario is a very useful and highly recommended CONVENTION (only). But it is not actually enforced by the SysML1.7 or UML2.5.1 metamodels or specifications.
Webel: MBSE: SysMLv1: Prefer a custom «actor» extension of a Block (such as the non-normative External) over UML-style Actor for use as parts in IBDs and on allocation swimlanes. You can also have a Trace from a block-based «actor» to a UML-style Actor.
Source
Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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UseCase
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A UseCase specifies a set of actions performed by its subjects, which yields an observable result that is of value for one or more Actors or other stakeholders of each subject.
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UseCase::extend : Extend [0..*]{subsets A_source_directedRelationship::directedRelationship, subsets Namespace::ownedMember} ... The Extend relationships owned by this UseCase.
UseCase::extensionPoint : ExtensionPoint [0..*]{subsets Namespace::ownedMember} ... The ExtensionPoints owned by this UseCase.
UseCase::include : Include [0..*]{subsets A_source_directedRelationship::directedRelationship, subsets Namespace::ownedMember} ... The Include relationships owned by this UseCase.
UseCase::subject : Classifier [0..*] ... The subjects to which this UseCase applies. Each subject or its parts realize all the UseCases that apply to it.
The use case diagram describes the usage of a system (subject) by its actors (environment) to achieve a goal, that is realized by the subject providing a set of services to selected actors.
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