Ensure that the entire organization participates in the requirements- gathering process. Prepare surveys and facilitate workshops that involve a wide range of stakeholders, users, and vendors.
Help the people at each level of the organization provide valuable input, and help them to understand the benefits of the proposed solution in their own language. For example, present executive summaries of critical project documentation to upper-level management.
Watch out for potential obstacles, and help the customer work cohesively with their technical consultants and vendors to resolve issues before they become setbacks.