Start with the work
Describe the task people are trying to complete today. Note where they switch tools, repeat an entry or wait for an answer. A concrete workflow is more useful than a long wish list.
Decide who comes first
An application may serve customers, operations teams and administrators. Choose the primary user and the first task that should become easier.
Separate needs from assumptions
List the requirements you know and the ideas that still need testing. A prototype is a useful way to examine the uncertain parts before development.
Plan for the information
Identify which systems hold the data, who can access it and how it needs to move. Integrations often shape the project as much as the screens.
Define the first useful release
Choose the smallest release that supports a complete workflow. Give the team a clear way to decide whether it is ready and what to improve next.