Observation, as with all methods, has limitations and ethical implications (Parahoo, 1997). Although observation
is a vital method of data collection, both unstructured and structured observations are vulnerable to biases.
Human perceptual errors and inadequacies are a continuous threat to the quality of obtained information
(Garrouste-Ortegas, 1997). Observation and interpretation are demanding tasks, requiring attention, sensation
and perception, representing in the current study careful construction and pretesting of checklists and rating
scales and the proper training and preparation of observers, all of which techniques play an important role in
minimizing biases.