Data Protection Impact Assessment (DPIA)

A DPIA matters because processing personal data can put individuals' rights and freedoms at risk, and the risk is greater when you handle special category data such as health records. The assessment helps you examine how data will be collected, used, stored, and deleted, what could go wrong, and what you will do about it. It also gives you a documented, repeatable way to show that you considered less intrusive alternatives and put safeguards in place before processing begins.

A good DPIA covers the full picture of your processing. It records the need for the assessment, the nature, scope, context, and purposes of the processing, the data lifecycle, any sharing with external parties, and whether special category data is involved. It documents consultation with individuals, colleagues, processors, and security specialists. It sets out the lawful basis, necessity and proportionality, safeguards against function creep, data minimisation, privacy information, and how you support individuals' data protection rights. It then captures each risk, its likelihood and severity, the overall risk level, the mitigation options, the residual risk, and whether each measure is approved, ending with the outcomes, actions, and sign-off.

Work through the assessment in stages. Confirm whether a DPIA is required and explain the triggers. Describe the processing in detail, including its nature, scope, context, purposes, and data lifecycle. Consult individuals and relevant parties, including colleagues, processors, and information security specialists. Assess necessity and proportionality, considering the lawful basis, whether the processing directly achieves its purpose, and whether a less intrusive alternative exists. Identify each source of risk and rate its likelihood, severity, and overall level. Identify and document measures to reduce or eliminate the risk and the expected effect of each measure. You can then rate residual risk, record the outcomes and any conditions, list the actions required before processing begins with owners and dates, make the overall decision, and obtain sign-off.

The sequence is designed so that each stage builds on the last. You start by identifying the need and describing the processing, because you cannot assess risks you have not defined. Consultation and the necessity and proportionality check come next, so that you understand the impact on individuals and consider less intrusive options. Only then do you identify and rate risks, because the risk picture depends on what you have already described. Mitigation and residual risk follow, so that the final decision and sign-off reflect what remains after your measures are applied.

Special category data includes health, biometric, and criminal offence data. Where such data is involved, the assessment asks you to identify it clearly and to give particular attention to the risks it may create for individuals. The checklist is designed with this emphasis in mind, for example when processing employee health records.

Where a regulation or standard genuinely applies, name it plainly. This checklist is aligned with UK Information Commissioner's Office (ICO) guidance, which sets out the DPIA process and the matters you should consider. Do not state requirements more specifically than you can support, and ground your assessment in what the checklist and the applicable guidance actually say.

Do not stop at identifying a risk. For each risk, describe the measures available to reduce or eliminate it, including alternative approaches you considered, state the expected effect of the measure, rate the residual risk level after the measure is applied, and record whether the measure has been formally approved. This gives you a clear record of what was done and what risk remains.