Accounting policies
The financial and economic contribution data covered in this report includes the accounts of MTRCL and all its subsidiaries except Octopus Cards Limited, a non-controlled subsidiary of the company. The data has been prepared in accordance with the accounting policies set out in the corporation’s financial statements. The environmental and social responsibility data is aggregated from various divisions within MTRC, principally operations, projects, property and human resources. Where applicable and verifiable the source of the data is specified accordingly throughout the report.

Sustainable targets and projections
The corporate targets are set through discussions with senior executives and directors based on past performance and measured expectations. Divisional targets are set through discussions within individual divisions and are based on the principle of continual improvement. Environmental targets for operations and project divisions are set in accordance with the ISO14001 certified Environmental Management System.

Limitations
The measurement, calculation and estimation of some of the environmental and social responsibility data carry some limitations that cause a degree of uncertainty in relation to the data reported. These include:

• Different interpretations of the reporting guidelines, such as those used for greenhouse gases and sustainability accounting
• Measuring, calculating or estimating the data according to the methods used, accuracy and sampling by environmental measuring equipment
• Data sourced from external entities and/or business partners where the company has no controlling interest in projects
  or contracts