Company Culture Handbook Policies Legal Policies A business case book is a script for presentations and deals that are used to build your business. They are a useful tool for entrepreneurs, managers, sales representatives and even consultants who are trying to improve their businesses. A good case study outline has the potential to help you fund your startup or convince an investor. The most important thing about this type of writing is that it should be highly convincing and captivating. A business case book is a script for presentations and deals that are used to build your business. They are a useful tool for entrepreneurs, managers, sales representatives and even consultants who are trying to improve their businesses. A good case study outline has the potential to help you fund your startup or convince an investor.