Usage- You have to calculate the usage of the application before getting it designed. In this way you will come to know about number of people who are willing to use your app.
Basics- Without any knowledge about the basics it would be likely impossible to get an app designed for your use. Make sure to design prototype in your mind for better view.
Features- Always make sure to add essential features only. Do not focus on filling the application with tons of features as it can make the app little bit complicated.
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