Vocational Training Act Article 32

The rank for each job category of skills certification can be rated as Class A, Class B and Class C in accordance with its scope of skills and level of specialty; the Central Competent Authority shall determine the rank for job categories which are not easily rated as three classes.
中文原文 職業訓練法第32條
辦理技能檢定之職類,依其技能範圍及專精程度,分甲、乙、丙三級;不宜分三級者,由中央主管機關定之。

English translation for reference only; the Chinese text prevails. Not legal advice.