7. Mistakes to avoid

7.1 Don't start collecting data without a timetable

Exhaustive data collection is tedious. In order not to let the collection time drag on, which would have a demotivating effect, it is necessary to establish a schedule upstream. This can include :

• Intermediate data rendering points. At these points, an analysis of the data obtained (quantity, quality) will be carried out. At this stage, the precise collection of certain data can be abandoned and replaced by estimates. For example, data which are too tedious to obtain, or which contain too many uncertainties to be representative, or which will result in a derisory carbon weighting in the final balance sheet.

• An end date. By this date, all essential...