Before revision: For example, case studies in medicine may focus on an individual patient or ailment; case studies in business might cover a particular firm's strategy or a broader market; similarly, case studies in politics can range from a narrow happening over time (e.g., a specific political campaign ) to an enormous undertaking (e.g., a world war) .
After revision: For example, case studies in medicine may focus on an individual patient or ailment; case studies in business might cover a particular firm's strategy or a broader market; similarly, case studies in politics can range from a narrow happening over time like a the operations of a specific political campaign , to an enormous undertaking like, world war, or more often the policy analysis of real-world problem affecting multiple stakeholders .