Causation cannot be determined... You cannot be certain which is the cause and which is the effect, as the correlational data is only supporting the idea that they are both occurring together.
A weakness is that you think the case study is easy. It is not. If your arguments do not go in court it is a weakness.
Obtaining information can be difficult as parties might tend to be secretive
You Smell!!! That's why books are good research methods...LOL books can be easily to get, and it very convient to find the question you'd like to kown and when you get the prosperous book which you...