Case studies overview on global purchasing-2) methodology section

Paper details:
This 5 pages will be a part of literature review. In order to have a complete literature review the professor asked me to provide some existing case studies regarding “Global Purchasing”.
It Is important that the paper has a table where is summarized at least : firm’s characteristic , reasons for global purchasing , size industry fields.
Is also important if you can find communalities or differences.
Than is important that you save one page 1 out of 5 for the methodology section. here you should explain how you have written the previous 4 pages.
1)Case studies article regarding global purchasing “Organisational design implications of global sourcing”.

2) Ikea case studies