The Supreme Court of India laid down extensive guidelines relating to Alternative Dispute Resolution (ADR) processes and Section 89 of the Code of Civil Procedure, 1908 in which landmark case?

Under Section 113 of the CPC, a Reference can be made to the High Court during the pendency of a case when:

The purpose of ________ is to enable subordinate courts to obtain, in non-appealable cases, the opinion of the High Court on a question of law and thereby avoid the commission of an error which could not be remedied later.