Little interruption of work flow or group activity
By being a passive observer, you can see an entire process
in action. Additionally, you will not "color" or effect
the process by getting in the middle or otherwise interrupting.
Works best with specific skill-based tasks
When observing a process with variable tasks it can be hard
to figure out when a step has been missed or a wrong decision
is made.
Generates data about actual behavior, not reported behavior
Observation does not mean interpreting what is seen, only reporting
it.
An astute observer can recognize interaction problems not easily
described by participants
For example, participants may not be aware of body language
and attitudes that may be misread by others.
The observer can follow action at different points in the system
When observing a specific skill based task the observer can
figure out when a step has been missed or a wrong decision is
made.
Administrative costs can be kept to a minimum
In general, the only cost of an observer is his income for
the task, overhead is minimal (except for his clip board).
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