This means that an Activity model in which non-determinacy occurs may be subject to timing issues and race conditions. It is the responsibility of the modeler to avoid such conditions in the construction of the Activity model, if they are not desired.

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INCORRECT InitialNode no implicit fork
CORRECT InitialNode explicit fork
OPTION double InitialNode
Source
Unified Modeling Language 2.5.1
Copyright information
About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
ActivityEdge
ActivityNode::outgoing
ActivityNode
token
If a token is offered to multiple ActivityNodes at the same time, it shall be accepted by at most one of them, but exactly which one is not completely determined by the Activity flow semantics.
Full quote
This means that an Activity model in which non-determinacy occurs may be subject to timing issues and race conditions. It is the responsibility of the modeler to avoid such conditions in the construction of the Activity model, if they are not desired.
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As an ActivityNode may be the source for multiple ActivityEdges, the same token can be offered to multiple targets.
However, the same token can only be accepted at one target at a time (unless it is copied, whereupon it is not the same token, see ForkNodes ... and ExecutableNodes ...).
An ExecutableNode is a kind of ActivityNode that may be executed as a step in the overall desired behavior of the containing Activity.
An ExecutableNode is an ActivityNode that carries out a substantive behavioral step of the Activity that contains it.
A ForkNode is a ControlNode that splits a flow into multiple concurrent flows. A ForkNode shall have exactly one incoming ActivityEdge, though it may have multiple outgoing ActivityEdges.
Tokens offered to a ForkNode are offered to all outgoing ActivityEdges of the node. If at least one of these offers is accepted, the offered tokens are removed from their original source and the acceptor receives a copy of the tokens.
The ActivityEdges going out of ForkNodes continue to hold the tokens they accept until all pending offers have been accepted by their targets.
If a token is offered to multiple ActivityNodes at the same time, it shall be accepted by at most one of them, but exactly which one is not completely determined by the Activity flow semantics.
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