Begin with the end in mind.
Stephen Covey
In Product Design, particularly in designing for the Elements of UX, this resonates well. It could help the designer focus on what is easily known and start from there.
In an app – what is it that the user creates and modifies?
Let’s take Facebook for example – one of the things that the user creates and modifies is a post.
Start with the post as an item when designing the Information Architecture, Interaction Design, and even the User Interface Design.
For one, because it is part of the main functionality so we want to focus on it.
To be more in detail, which part of the Genesis of an item should one focus, using the “End in Mind” principle? The created item, of course.
So if in doubt, design with the “End in Mind”.