Article 2: General Description of the Space Shuttle and SL Programmes A. The Space Shuttle programme refers essentially: to the definition, design and development of a Space Shuttle which will: serve in missions to deliver payloads to earth orbit; maintain station on orbit for mission durations in the order of seven days or more; provide safety monitoring and control over payload elements throughout missions; and provide seating and complete habitability for crews, including free movement between the Shuttle and SL. B. The SL programme provides for the definition, design, development and procurement of mannable laboratory modules and unpressurised instrument platforms (pallets) attached to and integral with the Shuttle and suitable for conducting research and applications activities on Shuttle sortie missions.