特定范畴

• The reason for this approach was in recognition of the fact that changes in different sectors ( eg transport , waste management , industry etc ) may be picked up using cross - sectoral indicators ( eg air quality indicators , gdp or income differential ) rather than developing less flexible sector - specific indicators
  采纳这个方法的原因，是某项政策或计划对不同范畴（例如，运输、废物处理、工业等）所带来的改变，可利用涵盖范围较广的指标（例如，空气质素指标、本地生产总值或贫富差距）反映出来，故无须拟订弹性较低、只适用于特定范畴的指标。