A functional analysis «whitebox» Activity may have swimlanes that Allocate to logical subsystems (logical handlers) within the 'problem' zone or to design/implementation level blocks.
The image shows a 2-level breakdown, first to logical subsystems in the 'problem' zone, and then to design level blocks in the 'solution' zone, although typically one can have many levels in complex systems.
At the bottom we see an Allocation matrix. For this simple example Classifier-level (Definition-level) allocation of Behaviors to Blocks is used, although one can use Usage-level allocation of Actions to part Properties. This examples shows a very simple one-to-one allocation correspondence, but in general more complex allocations may be required.
[ASIDE: In the Webel approach to SysML modelling use of anonymous part Property names and anonymous Action names are usually preferred, however they have the slight disadvantage that the callouts in some Allocation compartments are not always clear, so for pedagogical reasons Classifier level allocation is used here.]
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