What do we know about the customer's user base?
Who are they? Where are they? How Old?
Depending on the nature of the project, should it be a brand new Product or an evolution of an existing Product, existing data or analytics about the customer's user base that is available should be explored first.
This will help build a picture of the customers audience.
Make Customers Real
Humanising the audience is vital in placing the user central to the project.
Whilst not always seen as high value in today's Lean UX methods, Personas can help to make the project seem more human to your customers, bringing them to life as real people and real users.