When you are tasked with analysing a business process it is important to understand what the potential user will be using it for, how it will be required to work and what it will be required to do. There are many ways to model, interview and elicit exactly what the result should be.
The best way to avoid ending up with a broken process is by asking the people who are going to use it even going to the point of acting out the process step by step with the team. This will result in any discrepancies being ironed out but it will also result in improving buy-in and support during the role out as the team will feel involved and will know they think it is right for them.