User Interface Design
Design carefully before get started, so you won't regret. Especially, if you're working with non-programmer partners, make sure everyone is having the same imagination of its implementation.
Sketch
Draw it during the meeting/discussion, pen on paper or whiteboard is pretty enough.
Wireframe
You may need some handy tools to help, such as:
Mockup
You may need Adobe AI or PS for this stage.
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