Find two empirical studies that use generalizability theory to evaluate a test or measure (make sure to choose different sets of authors). Study those two articles, paying particular focus on the aspects of generalizability theory. Answer the following questions, comparing and contrasting both empirical articles. 

1. What was the rationale given for using G theory ? What rationale did the authors give for using G theory analyses compared to other techniques discussed in this book? 

2. What sources of error did the authors manipulate in their articles? Did they treat these factors as random or fixed? 

3. If the authors conducted a D study, did they use relative or absolute criteria to guide the analyses? 

4. What factors were found to be significant sources of error and which were found to be trivial? 

5. How did the authors use their GT findings to refine their instrument?