Phase 1, purpose: describe whether the interest belongs to the controller or a third party, the concrete situation supporting it, the benefit sought, and its compatibility with Brazilian law. Confirm that the data is not sensitive. If children or adolescents are involved, document how their best interest is observed and prevails.
Phase 2, necessity: identify the minimum data and operations needed for the purpose. Compare less intrusive reasonable alternatives, narrower populations, shorter retention, lower precision, or processing that avoids identification.
Phase 3, balancing and safeguards: assess the relationship with the person, collection source and context, purpose compatibility, likely expectations, scale, intrusiveness, vulnerability, possible harms, discrimination, and ability to exercise rights. Add safeguards, then decide whether rights and freedoms still prevail.