All of these classifications and differences need to be observed because each one is going to have practical differences in editing and when using microphones. When recording room tone and natural background sound you can usually get away with using an onboard microphone, but an omni- directional shotgun microphone is still going to be best. The shotgun microphone is also going to be best when you are recording people that are at variable lengths from the camera because the changes in sound levels that will be picked up will reflect the variable depth from the camera. A similar microphone will have to be utilized when trying to capture the dynamic of the environment, including things like echoes. Diegetic Sound can be captured with any sort of microphone that will fit the situation, whether it is a high quality shotgun microphone or a wireless microphone directly attached to one of the subjects to pick up dialogue. Non-Diegetic sound is even easier to deal with because you have significantly more control over it. Depending on what type it is, like voiceover or music, you can use different external programs to record and process it. For example, if you are recording a voiceover track you have the freedom to use an audio booth and record it using a program like Soundtrack Pro. This will result in audio that is very high quality, which is exactly what is required by voiceovers. Essentially, you need to know what type of voiceover or dialogue is being used before you can decide what type of microphone and recording plan you will have to use. It is also important to recognize when alternative sound mixing techniques should be used. Things like non-fidelity sound can be effective when you are editing your project, but make sure that it is used appropriately and not excessively.