Emissions and water
Totals are subdivided by activity as follows:
- Investment Portfolio, including directly owned assets and assets managed on behalf of investors.
- Developments, including activities associated with the development of commercial, industrial, and residential assets.
- Housing, including construction and operation of display homes.
- Occupied Premises, including Investa staffed office tenancies.
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About the confidence factors
We have allocated confidence factors to our data as a means of highlighting the differences in the reliability of different data sources and review processes. The factors indicate confidence placed by us in the reliability of the data and the assurance processes, not accuracy. We endeavour to ensure all published data is accurate. Confidence factors range from our assessment of "100% confidence" for data which is provided by supply authorities, processed into a utilities database and subjected to independent external assurance by KPMG, through to "20% confidence" for data which is estimated using rules of thumb or extrapolated from a limited sample. A thorough explanation together with more detailed definitions and references is provided in the Management Statement at the end of this report and via Investa's Reporting Rules, published on our website.
Confidence factors indicate our confidence in the reliability of the data and the assurance processes, not accuracy.
About the intensity statistics
Rules determining what assets are included and excluded from intensity statistics are quite stringent because of the need to maintain a reasonable basis for meaningful year-to-year comparisons. The intensity statistics presented in this document are based upon the same reporting groups and Net Lettable Areas as our 2007 Sustainability Report and so provide an update to previously reported results. We decided not to update the reporting groups to avoid confusion.
As explained in the management statement at the end of this document, the 2006/07 and 2007 reporting periods both include the six months from 1 October 2006 to 31 March 2007. This is the primary reason for the apparent deceleration in the rate of performance improvement.
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