3. Evaluate each site from the perspective of a building- construction manager. What feature in each site would be useful? What information is available that a man- ager might need? Overall, which site do you think would be most useful to the manager? Why? PPG isn't the only company that makes glass like Intercept. Visit PPG's Web site (www.ppg.com). Then explore the Web sites of one or more other similar manufacturers. These include Guardian Industries (www.guardian.com), Glass ACH Pilkington (http://www.versaluxglass.com/), and (www.pilkington.com/the+americas/usa/english/ default.htm). On the basis of your experience, answer the following questions (Hint: The NAICS code for Glass Manufacturers is 327211)