What are some advantages and disadvantages of using open- ended vs. close-ended items?

1. What are some advantages and disadvantages of using open- ended vs. close-ended items? 2. What are the different types of factor analysis, and how can they assist with scale construction? 3. Your research advisor is hounding you for some data on people’s attitudes toward the incumbent mayor, which you promised to deliver a while ago. The heat is on. You can choose to use an existing measure of reasonable (but not great) psychometric quality, or construct your own measure. Which route do you choose? Which scaling method would you use? Why?