This Instructional Activity is a part of the Lesson 5, Unit 5, Grade 8. The purpose of this activity is for students to identify where a function is increasing or decreasing from a graphical representation. In the previous activity students focused more on single points. In this activity they focus on collections of points within time intervals and what the overall shape of the graph says about the relationship between the two quantities. As students work, monitor for strategies for identifying increasing or decreasing intervals.