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Current Traffic Demand and its Traffic samples can be obtained from the geographic and time distribution. CFMU and/or local ATC centre(1).

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Analysis of the Traffic sample e.g. Traffic sample. obtained above. IFR/VFR mix; Fleet Mix; Aircraft performance mix, etc.

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Routes (IFR & VFR), instrument AIP and traffic sample; approach procedures and Holding patterns/areas.

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Radar Vectoring patterns Operational controllers

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Airspace dimensions AIP and Operational controllers

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Sectorisation (Terminal Airspace, Operational Controllers and ATC System adjacent Terminal Airspace and Lower specialists ACC sectors)

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Traffic Management i.e. Co-ordination Local ATC Instructions and Letters of agreements between sectors and Agreement.

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Existing constraints (e.g. terrain) PANS-OPS specialists / environmental specialists; policy makers.

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Existing ATM/CNS enablers (e.g. 5 Operational controllers/Engineers DMEs in Terminal Airspace)

Note (1): Part C, Chapter 4 explains how to select and analyse Assumptions. One of the most important assumptions is the Traffic Sample.
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Once the Reference (or Pseudo Reference) Scenario has been described, it should be critically reviewed. This critical review is a qualitative exercise which involves operational experts closely scrutinising the existing Terminal Airspace operations i.e. each element of the airspace organisation and how effectively and safely it works with a view to identifying operational problem areas. This is the stage at which existing constraints are identified, and the required mitigation and enablers (see Part C, Chapter 4).
Undertaking the critical review is a relatively straight-forward exercise – although it can be difficult for the design team to examine (what may be their previous efforts) in a critical light. As can be seen by the Reference Scenario and Critical Review Checklist in Chapter 8 Attachment C.8-1 and C.8-2, the Critical Review is concerned with establishing What is wrong, or What factors limit the Reference Scenario. On the positive side, aspects that work well should be identified (so that the benefits are not lost).
If, for example, the SIDs are being critically reviewed, the design team may agree that for most of the year, the existing SIDs meet the operational requirements in that they appear to respond to the actual aircraft performance of the current fleet mix. This said, however, controllers may notice that most heavy aircraft bound for the Far-East are unable to make the level restrictions on one of the SIDs when the temperature are high during the summer months. During the critical review process, this situation is identified – and may indeed be used to refine the design objectives discussed in Part B.
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本文鏈接地址：EUROCONTROL MANUAL FOR AIRSPACE PLANNING 2(14)