Visual representations that illustrate the sequential steps and decision points in a process, showing how inputs are transformed into outputs through various activities and pathways. They are used across a range of industries and technical contexts to document, communicate, and improve how work gets done.
Process Flow Diagrams
Process Flow Diagrams are visual maps of how a process moves from start to finish, laying out each step, decision point, and branch so a reader can see how inputs become outputs. They range from simple flowcharts to formal notations, and they exist to make the shape of work explicit rather than leaving it in people’s heads. When a process is drawn, it can be reviewed, questioned, and improved.
- Sequential steps - Activities are ordered so the path through the process is unambiguous.
- Decision points - Branches capture the conditions that send work down one path or another.
- Inputs and outputs - Each stage shows what it consumes and what it produces.
- Shared notation - Common shapes and conventions let different stakeholders read the same picture.
- A basis for improvement - Making the flow visible exposes bottlenecks, rework, and gaps.
In API work these diagrams are how teams reason about the operations that span multiple services, gateways, and human approvals. I use them to document governance pipelines, onboarding paths, and the multi-step sequences that a machine-readable workflow standard like Arazzo later formalizes. Where a diagram communicates a process to people, an executable workflow specification hands the same shape to automation and agents, so the informal picture and the formal contract reinforce each other.
Referenced on the API Evangelist blog
Where this standard shows up across sixteen years of my writing at apievangelist.com — how it fits into API design, governance, and the agentic turn.
