Whether a substance is new or existing is critical in undertaking chemical registration in Taiwan. All new chemical substances should be registered immediately. For most existing chemical, Phase I registration (only basic information required) is enough. Only chemicals designated as priority should comply with the Phase 2 standard registration. However, at present self-assessment referencing the online chemicals inventory is the only method available to determine chemical status and according to Taiwan EPA there will be no provision of a more comprehensive inquiry system in future, a subject of considerable concern for industry.