Substantial question of law permits appeal and confines hearing to the formulated question, subject to procedural safeguards. An appeal from the Appellate Tribunal to the High Court is permissible only if a substantial question of law is involved; the High Court may admit late appeals for sufficient cause. The Court formulates the substantial question, confines the hearing to that question (while retaining power to hear other substantial questions for reasons recorded), decides the question with reasons, may award costs, can determine issues left undecided or wrongly decided by the Tribunal, and requires multi-judge benches with majority decision rules.