The reason for doing the work at this stage is to understand the cost associated with implementing the system. We will shortly be producing a final business case and need to get an understanding of the cost of implementing the solution.
The checklist will provide most of the activities however each organisation and each solution will have activities unique to that project. The best way to find out all the activities is to start with the list, and use the headings to create a list applicable to that project. From there you can brainstorm other activities and even do some rough estimates of cost in the workshop.