Under Article 252, if two or more State Legislatures pass resolutions requesting Parliament to legislate on a State List subject, Parliament can enact a law applicable to those States, and other States may adopt it later by passing a resolution in their Legislature.

Article 252 cooperative federalism mechanism: (a) Trigger: Two or more State Legislatures pass resolutions requesting Parliament to legislate on State List subject, (b) Parliamentary action: Parliament enacts law applicable only to consenting States, (c) Subsequent adoption: Other States may adopt the law by passing resolution in their Legislature; law then applicable to them too, (d) Amendment/repeal: Only Parliament can amend/repeal such law, even for States that adopted later, (e) Use cases: Water disputes, environmental protection, inter-State transport — subjects requiring uniform regulation but within State domain. Illustrates flexible federalism: enables uniform legislation on State subjects through voluntary State consent, preserving autonomy while addressing inter-State challenges.