服務貿易的管制密集，因此管制也最有可能形成主要的貿易障礙，然而服務貿易總協定第6條第4項國內規章準則的談判卻幾近停滯。本文探究其中原因，著眼於管制、國內規章準則的共同點皆在於「管制」，而好的管制必然植基於成本效益評估，因此必要性測試即成為國內規章準則的核心。必要性測試的核心為管制目的、成本效益評估，本文觀察必要性測試的談判歷程，認為必要性測試的談判實不應透過管制目的的限縮，而應著重於成本效益的衡量，因此著重於成本效益評估要件的設計方有可能於必要性測試的議題取得突破。 / As service sector is heavily regulated, domestic regulation might become the major trade barrier. However, the negotiation under the General Agreement on Trade in Services (GATS) article 6.4 is almost stalled. The paper aims at analyzing the challenges in the negotiation. Focusing on the common nature of “governance” between domestic regulation and trade governance in GATS article 6.4, the paper argues that good governance must be based on impact analysis, which makes necessity test the core of GATS article 6.4 negotiation. The paper examines the negotiation history of necessity test, and argues that the focus of negotiation should be the necessity analysis, rather than the scope of objectives in necessity test. The solution of the negotiation challenge is therefore focusing on the elements of necessity analysis, particularly the trade restrictiveness.