CHAPTER 1 SYSTEMS: INTERNATIONAL SPACE STATION PLANNING—A ROADMAP TO GETTING IT ALL DONE 6 of the OOS is to provide an initial implementation of the increment requirements, as identified in the IDRD, GGR&C, and program directives, and establish the feasibility of satisfying the science commitments for the increment. Conversely, the OOS also serves to point out “hot spot” areas during the increment where crew time availability will be constrained or where other operations may not be possible to execute unless priorities are adjusted, often through detailed negotiation with the partners. Specifically, the OOS contains the following information: Greenwich Mean Time date, activity, activity location, comments, Russian ground site on-range times, solar beta angle (see Chapter 7), and increment day. Figure 1. Increment Overviews from the first expedition (top) and one from Expedition 41/42, 15 years later (bottom). In the top figure, the dates are placed across the top. Major vehicle attitude is listed, such as X-Perpendicular Out of Plane (XPOP) and local vertical/local horizontal (LVLH) as well as beta angle (see Chapter 7). Major activities such as a Soyuz launch are also shown below on the given date. Activities tend to be high level—Service Module (SM) outfitting, laboratory checkout (Lab C/O), and EVA preparation. In the bottom image, the data are essentially the same, though neither beta angle nor attitude are listed since the ISS now generally flies the same attitude.