I am in the process of going through a couple of use cases analysis with my company.
I am looking for documents and videos show the "before and after" Jive improvement with the use cases.
HR: with focus on Recruitment and Onboarding
Business Development: with focus on strategic business development and high level of collaboration - the company I work for develops business for third parties.
I couldn't find a specific place where all the business cases are located but try searching for "business case" keyword and there's a few.
There's also a general video discussion re building a business case in your community: Module 2: Building A New Community Business Case