The document provides instructions for a classroom activity where students work in teams to design and build a model of the International Space Station (ISS) using plastic bottles and PVC piping. The activity aims to teach students about the real ISS and what is required to keep astronauts alive in space. Students are tasked with brainstorming a design, making materials lists, assembling their model ISS, testing it, and debriefing as a team on their design process and results.