What is a flow chart?
A flowchart is a common type of diagram, that represents an algorithm or process, showing the steps as boxes of various kinds, and their order by connecting these with arrows. This diagrammatic representation can give a step-by-step solution to a given problem

: Why do you want to
use flowchart in your mobile interface design & screen interface design?
To make it simpler and also can be use as easy instruction.

How will it help your users to meet the interactive goals?
It will give a more simpler way to get feedbacks from the user who meet the goals.