Quick answer
A HACCP flow diagram should map the actual operation from the agreed starting point to its end, including inputs, delays, rework and handovers. Confirm it on site while work is happening and correct omissions before relying on it for hazard analysis. A neat diagram of the intended process is insufficient if staff work differently.
Make the diagram useful for hazard analysis
The diagram gives the team a shared view of where food, ingredients and other relevant materials go. Missing stages can mean missing hazards: a temporary hold, a return from packing, or a transfer to another room may introduce conditions that the main production line does not show.
MyHACCP’s flow-diagram guidance explains constructing the process sequence. Begin with the approved study scope and product description, rather than drawing a generic diagram first and forcing the operation to fit it.
Map stages, inputs and alternative routes
Walk through the operation with people who carry it out. Show the sequence and connections clearly enough for another team member to follow. Include relevant ingredient and packaging inputs, outsourced stages, storage, waiting time, rework or returns, waste routes and the final handover.
Use separate branches where products follow different routes. Number the steps so hazard-analysis and monitoring documents can refer to the same process. Add a legend where symbols are not obvious; the aim is clarity, not a particular drawing software.
| Part of the route | Questions to ask |
|---|---|
| Inputs | Where do ingredients, packaging, water and other relevant materials enter? |
| Main process | Does every treatment, handling stage and transfer appear in the right order? |
| Waiting or storage | What happens between stages, during breaks and overnight? |
| Alternative routes | Where do rework, rejected packs, returns and outsourced activities go? |
| Output and handover | Who receives the food and which storage or use assumptions follow it? |
Verify the diagram where work happens
MyHACCP’s on-site confirmation guidance requires comparison with actual operations. Observe relevant products, shifts and operating conditions, not only a quiet period chosen for convenience. Ask staff about exceptions and temporary arrangements.
Trace a batch or order through the map, checking both the food and relevant information. Compare the diagram with room use, equipment, labels and procedures. Record who confirmed it, when, which activities were observed and which changes were required.
Use an omission to improve the study
Illustrative example: a flow diagram goes directly from cooking to packing. Observation shows that some product waits in a separate area before packing, while another route includes cooling. Add the actual routes and conditions, then assess their hazards. Do not merely add a box labelled “waiting” without investigating what happens there.
A second example is rework that enters a later batch. Show the return route and identify the recipe, traceability and allergen questions it creates. Whether the rework is permitted must be decided through the relevant study and procedures, not by the arrow alone.
Keep the verified map connected to the plan
Update the diagram and affected assessments after relevant changes. A moved machine, new packing stage or revised distribution arrangement can invalidate an earlier confirmation. Retain enough version information to explain which diagram supported an earlier decision.
Use the existing small-business HACCP guide for the broader study sequence. A verified diagram is an input to hazard analysis; it is not evidence that every hazard has already been controlled.
Next steps
- Agree the boundary and map the real sequence with operators.
- Include inputs, delays, alternative routes and handovers.
- Observe and confirm the diagram on site, recording corrections.
- Link the approved version to the study and review it after changes.
Read the official practical guidance — Use the current source alongside the procedures for your own business.