There has been interest in infrared emittance and reflectance over the years due to space applications, solar energy, thermal imaging, etc. Several laboratories have built instruments to measure the emittance or reflectance of a variety of types of samples in some or all of the region from 1 to 25 micrometers. However, it appears that there are still no traceable standards available to calibrate these instruments. As a result of discussions among interested parties, a Round Robin was organized to circulate a few representative samples to as many laboratories as practical for comparative measurements. The various instruments represent different geometries and approaches to measuring what is expected to be the same physical property. The intent of the endeavor has been to assess the state-of-the-art and gain whatever understanding is possible from differences which are found in the results. It is hoped that: this will allow future improvements in the instruments and techniques, that it will add confidence in the data for the users, and that it can lead to future standards of infrared reflectance and emittance. Many samples were suggested. The final choice was influenced by availabilty, durability, reproducability, and ease of measurement by most instruments. Some samples were chosen to be specular and therefore measurable in an absolute sense. Diffuse samples were chosen to test possible variations in the angular response of different instruments. The results are summarized and compared. The contributors were encouraged to describe their instruments and methods in separate papers in order to have a more adequate opportunity to show those details. We believe that some progress has been made as a result of the cooperation, synergism, and serendipity of the project.