iPhone Application Developmentâ€”Grouping and filing in Performance Focused Project Set Up Part 3 In previous parts we have evaluate the set up of the project with performance in mind and have seen the importance of grouping and filing of the project resources so keeping continue we will go further in this part to know many things for iPhone app development. When we have a series of images in an iPhone app development project with same name but they are dependent upon a particular application variables then separation of these files is must so if we have created a tree of individual directories so we can separate them and can use same file names convention for sake of simplicity and maintainability. Another benefit of grouping and filing is that we can store many essential resources of same nature and names in their respective directories and can achieve them as per requirements so this kind of high level structure offer greater facilities and you can use subdirectories in each directory. We can use the properties of the Xcode to store the logical structures of the iPhone app development project separate from the underlying directory structure therefore each time we have to inform the Xcode about the changes we are making. Here we should be little be precautionary to take a backup of the project and related resources before you make some changes in iPhone app development project because when you make particular changes in the project you might lost your work if a mistake occur. Therefore, in next part we will discuss these changes.