Discuss Edwin Miller's answer to: How do you make an iphone app?

For developing an application for iphone, a person must have sufficient knowledge and skills. If a person is having expertise knowledge of Objective C & C++, Cocoa, XML and Xcode and if he is well-known of iPhone SDK then he can able to develop the most challenging application for iphone. He just need to proceed step by step and with the innovation of latest technology.