User centered design plays a vital role in product validation. A lot of developers and designers consider design as just pixels (oh! this interface looks good; a common statement). Without considering:

1) "how?" the design works.
2)"who" the design is for.
3)"why" the design.

At the time of writing this proposal, there are only a few tutorials on this. We'll take a look at what to put into consideration when designing applications for various platforms(web and mobile). I would share in detail my experience with designing user-centered cross platform applications.