Discuss what did you learn from the Case Studies? The case studies below provide examples of how different evaluation methods are used in different physical settings that involve users in different ways to answer various kinds of questions. They demonstrate how researchers exercise different levels of control in different settings. The case studies also show how it is necessary to be creative when working with innovative systems and when dealing with constraints created by the evaluation setting and the technology being evaluated. I really need help on this. Any help would be nice. And I need at least 200-250 words please and thank you!