When you go into the field, and record a fieldwork session, you can either record the whole session, or you can record each utterance. For example, suppose that you are interested in subject pronouns, and you want to transcribe the full paradigm. One way to do this is to press the start button on your recording device at the beginning of the session, and the stop button at the end. That way, you will have recorded the whole session. The other way is to record each individual sentence and word that you elicit.