Human error (or human differences) is also a factor (e.g., the reaction time to start the watch). Even when a measurement process is considered to be precise (e.g., a stopwatch), your judgement will often be involved in the use of the measurement (e.g., when to start and stop the stopwatch). This is known as researcher (or observer) error. During this measurement process, as the researcher, you can introduce error when carrying our measurements. There are many situations during the dissertation process where you are responsible for taking measurements. Some of the sources of error in your dissertation may include: researcher (or observer) error, environmental changes and participant changes. After all, the instability or inconsistency in the measurement you are using comes from such error. Threats to reliability are those factors that cause (or are sources of) error.
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