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A part or shared association has a default multiplicity of [0..1] on the black or white diamond end. A unidirectional association has a default multiplicity of 1 on its target end.

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Figure D.18 - Defining Structure of Power Subsystem (PowerSubsystem Breakdown)
Block, Generalization, Association: Home entertainment system
Association and Property - some cases
UML2/SysML1.x: If AggregationKind 'shared' has meaning to you (and if you use it consistently without contradicting the use of 'composite' aggregation elsewhere in your model) by all means use it. Damn the purists! But it's going to die in SysMLv2 anyway.
SysMLv1: A part Property or reference Property is not necessarily a 'memberEnd' or 'ownedEnd' of an Association ('association' or 'owningAssociation'). But an Association always as at least 2 'memberEnd' Properties. [With some MagicDraw/Cameo tool tips.]
SysMLv1: TIP: You can strengthen the ill-defined semantics of Property 'aggregation' (an AggregationKind) by applying custom Stereotypes to a Property, documented with its intended use. Not perfect, but better than not. EXAMPLE: «assembled»
SysMLv1: Some invalid multiplicity examples with navigable and non-navigable Association ends. In Cameo Systems Modeler with validation.
Association and Property - some cases - with dot notation and ownership indicators
Source
OMG Systems Modeling Language (SysML) 1.7
Copyright information
About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
RULE
UML keywords
Association
AggregationKind
multiplicity
AggregationKind::composite
AggregationKind::shared
MultiplicityElement::upperValue
MultiplicityElement::lowerValue
MultiplicityElement
MultiplicityElement::/lower
MultiplicityElement::/upper
Property::isNavigable()
DirectedRelationship::/target
SysML defines defaults for multiplicities on the ends of specific types of associations.
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A part or shared association has a default multiplicity of [0..1] on the black or white diamond end. A unidirectional association has a default multiplicity of 1 on its target end.
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These multiplicities may be assumed if not shown on a diagram. To avoid confusion, any multiplicity other than the default should always be shown on a diagram.
A property typed by a Block that does not have composite aggregation is classified as a reference property.
The supported variety of notations for associations and association annotations has been reduced to simplify the burden of teaching, learning, and interpreting SysML diagrams for the systems engineering user.
Notational and metamodel support for n-ary associations and qualified associations has been excluded from SysML.
The use of navigation arrowheads on an association has been simplified by excluding the case of arrowheads on both ends, and requiring that such an association always be shown without arrowheads on either end.
An “X” on a single end of an association to indicate that an end is not navigable has similarly been dropped, as has the use of a small filled dot at the end of an association to indicate that the end is owned by the associated classifier.
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