19. How do managers assess, or control, a project? a. They work with an assistant who checks the progress of each process and phase. b. They use a software product that allows anyone working on the project to modify processes. (C) They employ a monitoring system for a project so that progress can easily be assessed. d. They recruit an independent reviewer to assess the project's progress and processes. 20. What do nodes represent in a network diagram? (a) Activities b. Events c. Conditions d. Slack 21. Which of the following is used to represent activity in a network diagram? a. A solid line b. A diamond (c) A circle d. A square 22. What is true about setting times of activities within a network diagram? a. Time is represented within the lower portion of a diamond. b. A larger circle represents a longer time period. C. A longer line represents a longer time period. d. The length of a line reflects only distance to an event. 23. Which of the following is a convention that must be applied when drawing a network diagram? a. Only one event can be joined by one activity. b. All diagrams must have at least three events. c. Each event must have only one subsequent activity. (d.) Each event must have at least one preceding activity