Final answer:
A personal message should be customized when adding a new collaborator to a sheet or workspace, along with setting the correct permissions and potentially the Default View, to ensure clear communication of their role and access level.
Step-by-step explanation:
When adding a new collaborator to a sheet or workspace, it is important to customize a personal message to help the new collaborator understand why they are being added and how they should use the information. The personal message should include relevant details about the project, the expectations for the collaborator, and any specific instructions or guidelines they should follow. Additionally, setting the appropriate permissions is essential to ensure that collaborators have the correct level of access to the information required to fulfill their role. It may also be beneficial to customize the Default View to prioritize the data or tasks that are most relevant to the new collaborator's responsibilities.