A platform for model-based, multi-disciplinary design, which supplies the basic functional and procedural infrastructure for the modeling, analysis, sizing and optimization of complex engineering systems. Provides unique modeling and analysis capabilities. Pacelab extends the platform with domain-specific functionality for preliminary aircraft design. Supports the evaluation of conventional & non-conventional configurations. SysArc adds a further functional layer for systems architecture design. Enables investigations and trade-offs at the aircraft level.