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ALGO is a high-level programming language for implementing algorithms in the context of the European Space Agency's (ESA) mission planning and analysis. Developed by the ESA, ALGO provides a structured methodology for specifying and solving complex algorithmic problems efficiently across different mission domains such as telecommunications, Earth observation, planetary exploration, and human spaceflight. The language integrates mathematical constructs with flow control statements to model operations that might involve satellite control or data processing tasks within missions. ALGO's syntax is easy to understand and allows engineers to abstract complexity into manageable code structures for verification against system requirements before being implemented in flight software.