The notice must include a description of all the purposes for which the personal data will be processed.
It is advisable to keep the description of the purposes as broad as possible, whilst ensuring that it is accurate and not misleading.
If a purpose is missed out, the personal data may not, in most cases, be used for that purpose without reissuing the data privacy notice, setting out the new purpose, processing condition and other relevant information.
This does not mean that you can include in the notice every possible purpose; the purposes included must be reasonably foreseeable.
NB "Process" - means any operation or set of operations which is performed on personal data or on sets of personal data, whether or not by automated means, such as collection, recording, organisation, structuring, storage, adaptation or alteration, retrieval, consultation, use, disclosure by transmission, dissemination or otherwise making available, alignment or combination, restriction, erasure or destruction.