Data Flow Diagram Guide
1. Purpose of This Guide
A personal data flow diagram shows how personal data moves through your organisation — from the moment it is collected
from a customer, staff member, or other individual, all the way through processing, storage, and sharing.
For Cyber Essentials and similar standards, this diagram proves that your organisation:
- Understands where personal data lives,
- Knows who processes it,
- Can identify risks, access points, and safeguards, and
- Has a clear, documented view of its data lifecycle.
Think of it as your “map of the kingdom” — showing auditors that your data isn’t wandering around the castle
unsupervised.
2. What You Will Submit
Please upload one clear diagram (image or PDF) showing:
- Entities that provide personal data
(e.g., Customers, Staff, Website Users)
- Systems and services that receive or process this data
Examples: CRM, HR system, payment processor, ticketing platform, inventory system, email inbox, etc.
- Arrows showing how personal data flows between these systems
Each arrow should represent a specific flow, such as:
- “Customer submits form”
- “CRM stores contact details”
- “Data sent to email service provider”
- Any third-party processors or cloud tools
(e.g., Stripe, Google Workspace, HubSpot, Microsoft 365)
- Clear labels explaining what data is being passed
Examples: “Name + Email”, “Payment details”, “Order information”
This should look similar in style to the sample diagram below, which shows business data flows, not personal data.
3. How to Collect / Obtain / Generate This Evidence
Follow these steps to build your Personal Data Flow Diagram.
You can sketch it in any tool you prefer — PowerPoint, Draw.io, Lucidchart, Miro, Canva, or even a PDF editor.
Step 1 — Identify where you collect personal data
List all touchpoints where your organisation collects data:
- Website forms
- Customer registration
- Staff onboarding
- Appointment/booking system
- Payment checkout
- Support/helpdesk
Step 2 — Identify systems that store or process this data
Common examples include:
- CRM (HubSpot, Salesforce, Zoho)
- HR systems (Talenox, BambooHR, JustLogin)
- Email platforms (Google Workspace, Microsoft 365)
- Payment processors (Stripe, PayNow, PayPal)
- Project or ticketing systems (Jira, Zendesk)
- Cloud storage (SharePoint, Google Drive)
Step 3 — Map the flows
Draw arrows to show how personal data moves:
- From customer → website → CRM
- From CRM → email system
- From payment page → payment processor
- From staff → HR system → payroll provider
For each arrow, label:
- The type of personal data involved
- The purpose (e.g., process order, respond to enquiry)
Step 4 — Include external processors
If data leaves your organisation, auditors must see it.
Examples:
- Payroll vendor
- Cloud hosting provider
- Payment gateway
- Marketing email provider
Step 5 — Export as an image or PDF
Most tools allow: File → Export → PNG/JPG/PDF.
Keep the final diagram clean and readable.
4. Evidence Format
Accepted File Types:
- PNG
- JPG
- PDF
Suggested Naming Convention:
YourCompanyName_DataFlowDiagram_YYYY-MM-DD
Example:
AcmeClinic_DataFlowDiagram_2025-01-12.pdf
5. What “Good” Looks Like
A high-quality Personal Data Flow Diagram should have:
- Clear entities
Labeled people or groups providing data (e.g., Customers, Staff).
- All major systems included
Internal systems + external vendors.
- Clear arrows showing direction of data flow
Each arrow must have a purpose and data type label.
- No ambiguous or missing steps
If personal data touches it, it must appear in the diagram.
- Readable layout
Avoid clutter — the sample provided is a good reference for simplicity.
- End-to-end visibility
Shows: collection → processing → storage → sharing/disposal.
Sample:
Why this matters: auditors want to see that you know where personal data travels, so that you can protect it
deliberately — not by accident.
6. Tips
- Keep it simple.
You’re drawing a map, not a masterpiece. The goal is clarity, not art.
- Redact sensitive data.
Never include real personal data in the diagram — only categories like “Name”, “Email”, “NRIC (if collected)”.
- Review it annually.
Systems change, processes evolve — keep the diagram fresh.