Proper parties are those who, though not interested in the Plaintiffs claim, are made parties for some good reasons e.g. where an action is brought to rescind a contract, any person is a proper party to it who was active or concurring in the matters which gave the plaintiff the right to rescind. Desirable those who have an interest or who may be affected by the result. Necessary parties are those who are not only interested in the subject-matter of the proceedings but also who in their absence, the proceedings could not be fairly dealt with. In other words the question to be settled in the action between the existing parties must be a question which cannot be properly settled unless they are parties to the action instituted by the plaintiff.
– Oputa, JSC. Green v. Green (1987)