A workflow is a sequence of inter-dependent steps, called tasks, that given
The (intent to perform an) execution of a workflow Throughout the system it is often referred to as just "invocation".
The executable unit in a workflow. In this case all tasks are Fission Functions.
The (intent to perform an) execution of a task. Throughout the system it is often also called a "function"".
The core part of the Workflow Management System, responsible for the scheduling and controlling of workflow.
wf = workflow
wfi = worfklow invocation
ctrl = controller
expr = expression