The APACHE project proposes a new framework to assess European ATM (air traffic management) performance based on simulation, optimization and performance assessment tools that will be able to capture the complex interdependencies between KPAs at different modelling scales. This document presents the software requirements for the APACHE System. The APACHE System is the platform, build up with different software components (existing and to be developed) implementing a wide set of performance indicators across several key performance areas (KPA). Moreover, the APACHE System can be configured to synthetize aircraft trajectories and airspace sectorisation for future scenarios, in line with the SESAR 2020 scope, where input data is not available (and also for hypothetical scenarios based in the current concept of operations). The software requirements presented in the current document are classified as functional requirements, non-functional requirements and domain requirements. These requirements relate to the first phase of the software development cycle, depicted as Requirements Analysis. This is the base for the following phases: Design, Development, Testing and Implementation.

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