This is a formal deed (contract under seal). This is a generic format between two parties - "Party A" who can be a person, a sole trader, a partnership or a company or an assigned authority for a company (under an Instrument of Delegation) and "Party B" who is a person who is mentally ill but who can read and write. In this example Party B signs but is looked after by his/her protective commissioner who also acts as witness. Australian legal agreement (any State).
Agreement with a person who is mentally ill but who can read and write.