Visyond improves transparency and accountability.
You can invite people to collaborate and their assumptions, comments or attachments (yes, you can attach files in a Visyond cell) will always be available to you and ready to be printed as a cover note to the model analysis.
You can track multiple assumptions in a cell and always be in control of what you present.
See:
How to create Cases in Visyond
How to run Scenario analysis in Visyond
Cases, scenarios, collaboration (overview video)
Reports and presentations