Problem Description. This important first step is often overlooked by investigators who
are more anxious to use their instrumentation to measure contaminants in the building air.
In order to diagnose a problem one must first define the problem. This step involves
interviewing the building occupants and carefully documenting descriptions of the
complaints including physical symptoms and perceptions (i.e. odors, thermal comfort).
Often important information regarding the problem is developed which assist in the
formulation of the test protocol. This information may be collected by either informal oral
interviews or by written questionnaires. Oral interviews are often preferred because they
are more personal and allow for collection of more detailed information than would be
possible with a written questionnaire. However, a written questionnaire administered to
the entire building may be useful in discovering additional "silent" dissatisfied occupants
which may be indicative of additional problem areas.