You can use a customer/user journey map that focuses in this case on the 'journey' that the user is taking on the application. It's a rich visualisation of the process and touch points which works great in groups.
There are loads out there on journey maps, but a good place to start is at:
User Jourenys - The Beginner's Guide
What is a user journey?
A user journey is a series of steps (typically 4-12) which represent a
scenario in which a user might interact with the thing you are
designing. They can be used for 2 main things:
Demonstrating the way users currently interact with the service /
website / product Demonstrating the way users could interact with the
service / website / product
Important to note: A Customer/User journey maps is a very valuable tool to use not only on the application in this case, but zoom out to see the whole 'journey' that captures the true experience that the user has when engaging with your company.
More useful reading: The Value of Customer Journey Maps