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The expression Qualitative Analysis is significant in that it implies that expert judgement is required in order to make a meaningful analysis.

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Safety and Performance Criteria as well as Assumptions, Enablers and Constraints are constants to the entire Terminal Airspace modification process. They are carried through to the Assessment and Validation phases of the project (see below).

1.1.3 DESIGN GUIDELINES (CHAPTERS 5-7)
Last – but not least – the Design Guidelines provide the third component of the Design Methodology. They explain how to design the different parts of a Terminal Airspace i.e. routes, holds, the airspace and ATC sectorisation.

As with the design concept, the design guidelines are also made up of several components, undertaken in a specific order. Usually, this order is
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routes and holds are designed first;

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the Terminal airspace structure is designed second;

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ATC sectors are designed third.

However, throughout the design process, early design of each component may be adapted or altered in light of evolving considerations of the other components i.e. a continuous process of qualitative analysis and adaptation unless a coherent and effective end result is achieved.
Edition: 2.0 Released Issue Page C-1-3 Amendment 1 – 17/01/05
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In the overall Terminal Airspace Design process, the Design Methodology underpins the airspace design and is placed after planning (where the operational requirements and objectives are identified) and before assessment and validation takes place.

As far as the designer is concerned, the Design Methodology starts with the Reference Scenario and is followed by the Design Concept. This concept would be based on a set of Design Guidelines (which may be of a national nature or those contained in this document).

Because this document provides guidance as to how a Terminal Airspace should be designed, however, the Design Guidelines are identified as a separate ‘component’ of the Design Methodology. In reality, however, the design concept would be based on the other elements of the design concept and a set of design guidelines.
In the context of actual Terminal Airspace design, it may be said that the Reference Scenario and Design Concept are the main products of the Design Methodology. Once established, these two components are then assessed (as discussed in Part D), and once a Design Concept is selected – because it has reached a suitable stage of maturity – the Design Concept is validated and implemented (and the Reference Scenario put to one side). Notably, the assessment involves comparisons with the Reference Scenario, and consistency checks with the design concept - hence the reverse arrows below.
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Although it is not possible to claim that each of the four steps should all be completed in order to ensure successful design, what can be stated with certainty is that a design process starts at a conceptual level and that expert judgement is integral to each of the four steps.
　
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本文鏈接地址：EUROCONTROL MANUAL FOR AIRSPACE PLANNING 2(8)