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Diary studies is a research method that collects qualitative information by having participants record entries about their everyday lives in a log, diary or journal about the activity or experience being studied. This collection of data uses a longitudinal technique, meaning participants are studied over a period of time. This research tool, although not being able to provide results as detailed as a true field study, can still offer a vast amount of contextual information without the costs of a true field study.[1][2] Diary studies are also known as experience sampling or ecological momentary assessment (EMA) methodology.
Traditionally diary studies involved participants keeping a written diary of events. However the emergence of smartphones now enables participants to diary with photos, videos and text using a variety of online or offline apps and tools. Since the diary studies are recorded sequentially over time, it can be used to investigate time-based phenomena, temporal dynamics, and fluctuating phenomena such as moods.[3]
Diary studies can also be employed together with other research techniques within a mixed method framework and is particularly useful in obtaining rich subjective data.[4] For instance, experience sampling method (ESM) combines it with questionnaires to gather data and examine people's experiences in daily life.[5]