Comment:

This section refers to a common clinical pathway http://hl7.org/fhir/uv/cpg/2019SEP/common-pathway.html. It's unclear how complete or exhaustive this is meant to be, but the diagram implies a sequential set of activities. Health care is usually provided in parallel paths, e.g., testing, counseling, diagnosing (provisional, final), prescribing, etc. tend to happen simultaneously except for very straightforward chief complaints and diagnoses (e.g., sore threat and strep pharyngitis).

Summary:

Parallel vs sequential pathway