The User's Network for Applied Modeling of Air Pollution (UNAMAP), Version 6 (Revised 1/88) contains 30 air quality simulation models. These models input emission and meteorological data to calculate projected air pollutant concentrations. UNAMAP contains state-of-the-art dispersion research algorithms funded by the EPA's Office of Air Quality Planning and Standards for Environmental Impact Analysis. The Industrial Source Complex (ISC) Model has undergone several revisions since first being issued in order to correct and improve technical features and to make the model more appropriate for specific applications. Recent changes to the UNAMAP 6 version of both ISC Short-Term and ISC Long-Term include the ability to model receptors located above ground level ('flagpole' receptors) and a revised building downwash treatment method. These changes are covered in the addendum.