Users who have their own login to a computer will have their own content 'bucket' and will have full control over its content and be able to organise, edit and delete content at will.
Users who share a computer with a generic login also share the collected content within the planning tool. Users need to agree a way to identify content that 'belongs' to a particular individual. One or more personalised headings could be created. One way could be to use the user's initials. e.g. KFL - Mathematics Objectives.
When users are sharing a content bucket, the use of this button should be prohibited because all the content is deleted including content collected by other users.
When users are sharing a content bucket they should avoid adding to or deleting from a personalised heading.