The limitations (the modern contract's regulation):
1. Mandatory law: the statutory invalidity floors (the void-and-voidable categories — Unit 5); the formalities (the writing-and-attestation requirements for the defined contracts — the registration-linked enforceability);
2. Good faith-and-fair dealing: the Code's good-faith performance standard (the civil-law family's signature — the duty to perform honestly, to cooperate, to inform);
3. The protective statutes: consumer, labour, tenancy — the weaker party's shields against the standard form's terms;
4. Public policy: the immorality-and-illegality bars (Unit 5); the constitutional rights' horizontal reach (equality-and-dignity in the private-bargain context — the human-rights influence below);
5. The form's own limits: exemption-clause control (Unit 4); unfair-terms doctrine.