pages G4-20 / G4-21 Boundary of the report; Specific limitations on the scope or boundary of the report; Basis for preparation of the report concerning joint ventures, subsidiaries, leased premises, assigned operations and external services, in addition to other entities that could significantly affect the comparison between different periods and/or organisations Sustainability Report 2015 pages 4, 52-55 G4-22 Explanation of the effect of any revisions to information provided in earlier reports and the reasons for such revisions Sustainability Report 2015 page 4 G4-23 Significant changes in relation to previous reporting periods in terms of scope, boundary or measurement methods.