I want to know who created this contact and who updated the information for this contact, it should have “Created By” and “Updated By” fields.

Figure: Contact information

Suggestion: Adding “Created By” and “Updated By” fields for contact information, and automatic save the logon user to the fields after a contact information was created or updated.

We have a rule better to interfaces about this, please see Data Entry Forms – The way to develop Data Entry Forms – Created/Last Updated By Fields