xxxi the things the ground team has to think about. If the unfortunate day ever comes, NASA will be prepared (Chapter 12). As with any remote outpost, supplies and fresh personnel have to be brought to the station and ferried home. This process, which has also evolved significantly over the lifetime of the space station, is discussed in Chapter 14, along with the continuous coming and going of these visiting vehicles. As can happen in any home or research facility on Earth, things sometimes break or need to be modified. In-Flight Maintenance (Chapter 16) discusses making these repairs—whether it be finding a leak, or fixing a stuck hatch or a broken computer. Some installations or repairs require a spacewalk, as described in Chapter 18. More serious failures also occur in space, such as when the pump that controls half of the critical cooling system on the ISS fails. In this case, all systems are affected and every team, including robotics and EVA, are involved in the recovery in what is known as an “all hands on deck” scenario. These cases are discussed in Chapter 20, “When a Major Anomalies Occur.” Acronyms, references, and information on the authors of this book can be found in the Appendix.