The necessity test involves you considering if the processing is actually necessary for the specific purpose identified in the purpose test. You should consider if: the processing will actually help you achieve your purpose the processing is proportionate to that purpose the purpose could be achieved without processing the data (or by processing less data) the purpose could be achieved by processing in another less intrusive or more obvious way If other less intrusive alternatives to processing the data exist, you need to clearly set out why these are not reasonable alternatives in your LIA. If it becomes difficult to explain how the processing helps you achieve your specified purpose, or if many alternative methods exist which aren’t your chosen business model, the purpose may need to be further specified. For more information, read Legitimate interest assessments.