834 ITU‐T's Technical Reports and Specifications Table 1 – Comparison of KPIs between index systems and sets of KPIs Dimension Sub‐ dimension Indicators ISO IDI UN‐Habitat CIC MOHURD ECI Italy TTC GCIF GPC ESCI ERMC EUSI Wheel Ericsson IBM IDC PwC Siemens I2.2.5 Improvement of fossil fuel usage with ICT measures (per GDP) X X X X X X X X I2.2.6 Improvement of rare metal/noble metal usage (per GDP) with ICT measures X D3 Productivity D3.1 Innovation I3.1.1 Percentage of R&D expenditure in GDP X X X I3.1.2 Ratio of knowledge‐intensive enterprises X X X I3.1.3 Revenue share of knowledge‐intensive enterprise X I3.1.4 Patent number per 100,000 inhabitant X X X I3.1.5 Importance as decision‐making centre (HQ, etc.) X