This document will provide guidance for those people responsible for conducting indoor air quality (IAQ) investigations in office buildings. It will assist them in determining the cause of poor IAQ, in establishing at what point specific professional services are required, and in defining the methodology and scope of a particular IAQ study. This report is designed for use by property managers, building maintenance staff, health and safety officials, and consultants working in the occupational environment field. It will facilitate communication between those responsible for investigating IAQ complaints and all other concerned persons.