GDPR A5-03: Data Minimisation Compliance
Data minimisation is a foundational GDPR principle that protects individuals by limiting how much personal data you collect and process. This control requires you to collect only data that is adequate, relevant, and necessary for your stated purposes. For SMBs managing multiple data processing activities, conducting regular data minimisation reviews prevents scope creep, reduces risk, and demonstrates accountability to regulators.
What this means
Data minimisation requires that any personal data you collect must be adequate and relevant to your processing purpose, but never excessive. You cannot collect 'just in case' data or retain information longer than needed. This principle applies at the design stage of new systems and processing activities, and must be revisited periodically. The control emphasizes building minimisation into your data handling practices from the start rather than removing data after collection.
How to comply
- 1.Document the legitimate business purpose for each data collection point in your systems.
- 2.Define which specific data fields are truly necessary to achieve that purpose.
- 3.Remove or deprioritize optional data collection fields that do not directly support your stated purpose.
- 4.Establish data retention schedules that specify deletion timelines for each data category.
- 5.Conduct data minimisation reviews during the design phase of new applications, services, or processing activities.
- 6.Create a data inventory that maps collected fields to their business justification.
- 7.Train teams on minimisation principles so designers and product managers apply it to new features.
- 8.Review and audit existing systems annually to identify and remove unnecessary data fields.
Evidence auditors look for
- Data Processing Impact Assessments (DPIAs) documenting data minimisation decisions for new systems.
- Data inventory spreadsheets listing collected fields and their business necessity justification.
- Data retention policy defining deletion schedules by data category.
- Design documents for new applications showing minimisation review sign-off.
- Audit reports identifying unnecessary data fields removed from existing systems.
- Privacy notices clearly stating what data is collected and why.
- Meeting minutes from design reviews discussing why certain data fields were excluded.
- Consent forms or transparency documents showing only necessary data is being collected.
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
GRCWatch automates data minimisation reviews by tracking your processing activities, flagging unnecessary data fields, and generating audit-ready evidence that documents your minimisation decisions across all systems.
See how GRCWatch handles this control automatically
Start free trial