Guidance for staff on carrying out a data legitimate interest assessment (lIA) When do I need to carry out an LIA? When you rely on 'Legitimate Interest' as your legal basis, you will have to complete an LIA. Has an LIA already been done for what I want to do? You can check if an LIA has been done for your project/system/policy on the Data Protection SharePoint Intranet. List of Legitimate Interest Assessments Requesting an LIA When you need to conduct an LPIA, email the Data Protection Officer at email@example.com and you will be assigned an assessment through our online tool. The assessment tool is a platform hosted by a third party.