Search the internet for credible topics that discuss wireframe and mock-ups.

In your discussion,

Discuss how paper prototyping could be an initial step to rapid prototyping.
Compare and contrast prototyping, wireframe, and mock-up
discussion board 2:Find an example of an app that uses multiple fragments and combines them into one single activity.

In your post,

Identify the app by providing the name and a URL to the app.
Discuss how multiple fragments are combined in one single activity for building a multipane user interface in the app.
Discuss reusing fragments in multiple activities.