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ut to choose the consultants that will support the execution of the plan ? It is this plan that is presented here for discussion ? Input from this discussion will be used in steering the consultant’s work 4 Underlying principles ? Guidebook intended main users ? Experts responsible for preparing national air pollutant emission inventories to be reported under both CLRTAP (and its protocols) and the NEC Directive ? Guidebook objectives ? Support pliance with reporting obligations under CLRTAP and NEC ? Support inventory improvement process 5 What would the Guidebook include? ? Complete source descriptions ? Guidance on good practice aspects such as key source analyses, QA/QC systems, uncertainty management and projections ? Guidance on methodological choice (incl. decision trees) ? Tier 1 methods for all pollutants from all sources ? Tier 2 methods for potential key sources ? Tier 3 methods for particularly important methods or methods already included in the Guidebook ? Emission factors, both default and technol