Terminal Airspace Project –  Major Infrastructure project  External Directive projects  ATM Project 
(9) Assumptions  Time Pressures, external to ATM Other airspace requirements  Requirement for common assumptions across several project teams is common.  can be affected by external requirements but otherwise selected by Terminal Airspace design team 
(10) Constraints  C, Chapter 4) Potential for technical enablers being provided (usually because of project profile and ease of access to higher-level management)  Time Requirement for common assumptions can reduce design flexibility Increased co-ordination  Time Pressures, external to ATM Other airspace requirements 
(11) Enablers  (Part Greater spread of expertise readily available to Terminal Airspace Design team (from other projects); Greater likelihood of technical enablers being provided usually because of project profile and access to management  Greater spread of expertise readily available to Terminal Airspace Design team (from other projects); Greater likelihood of technical enablers being provided usually because of project profile and access to management  Potential for technical enablers being provided (usually because of project profile and ease of access to higher-level management) 

Table 1-I: Comparison of Sample Project Types
1.3.2 IMPACT ON PLANNING
It has become evident that all Terminal Airspace design projects are undertaken in response to a particular requirement and that the source of a particular requirement largely determines the type of managerial framework for the project. Similarly – and quite predictably – these differences are also reflected in the extent and number of planning steps. Although this is dealt with fully in the next chapter, it is useful to consider what impact this has on planning. By way of introduction, the next diagram shows a sequence of sample planning steps and that the number of steps is dependent upon the managerial ‘type’. In Figure 1-2, planning for-
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A Major Infrastructure project would commence at the rose-coloured dot (with the Project Steering Group) in the form of a General Requirement and the Terminal Airspace design team is created to undertake a specialist sub-project and to determine the design objective from the project objective defined by the Project Steering Group.

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An External Directive project would start at the mauve-coloured dot. In this case, the trigger for the project is handed to the Terminal Airspace design team as a projectobjective.

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An ATM Projects would commence at the green-coloured dot where a project has been triggered by either an ATM or User Requirement (known as an Operational Requirement) identified by the Terminal Airspace design team; from which designobjectives are formulated.

These different levels of objectives are amplified in the next chapter.
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STOP
Cross Check FEASIBILITY Design Objectives match
ASSESSMENT  Strategic Objectives Tasks & Task Allocation Availability of Specialist Resources (People/Funds) Agreement on DesignMethodology Availability of Validation tools (e.g. Simulators) & Cost
Key:
Major infrastructure project
External Directive projects
ATM Project
Figure 1 - 2: Different Planning Processes
　
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