High-level flow focuses on Goals (What you want to do) and references the Tasks (How you do it).
“What would it look like?”
I have to agree with ‘boxes and arrows’ which focus on Workflow – and probably also identifies Actors.
Consider the purpose:
The high-level flow provides a simple, clear (and accurate) reflection of the business
- for sign-off by management stakeholders
It also provides practical “domain-related” working context
- for the technical implementation team
You can also provide some “drilldown’ screenshot layouts to illustrate some of the mission-critical boxes because …
- Everybody loves pictures and
- “But – What will it look like?” is always the first question asked
For the most part – “high level flow” is UX, screenshots are UI.
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