Likely much of the high level inventory work has already been performed by senior management. Just ask for a detailed organization chart for the company. It represents the business' best guess at where resources need to be focused and it likely represents the high level prioritization of the processes within that business. Sitting down with management and having them go through the org chart is often the best way to kick off an assessment. It will also provide a good vehicle for discussing management's perception of the existing and future risks within the business and identifying th senior managers you will need to talk with as part of the detailed inventory.
Once you have the processes properly identified and prioritized you can expand outward to identif the related types of information and the infrastructure that manages that information.
Now you can start asking specific questions:
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