The problem was the Oshkosh Fire Department does not have a comprehensive size-up guideline that includes the use of thermal imaging cameras, thus placing firefighters at possible risk for serious injury or death. The purpose of this research is to identify the issues of utilizing thermal imaging cameras while performing size-up on the fire ground. The descriptive research methodology was utilized to answer four research questions.The questions answered were: (a) What are the national, state, and professional guidelines for utilizing thermal imaging cameras for size-up; (b) What are the technical and professional capabilities of thermal imaging cameras in providing the extent and location of a fire during size-up; (c) What are the thermal imaging camera guidelines used by fire departments in Wisconsin; and (d) What are the advantages and disadvantages of using thermal imaging cameras during size-up on the fire ground? The procedures that were used to obtain data were a survey of fire departments in Wisconsin, interviews of fire departments, and an observation of an acquired structure burn. It was found that only ten percent of the fire departments that answered the survey in Wisconsin utilize thermal imaging cameras for size-up on a regular basis.During interviews of fire departments, they reported advantages and positive outcomes to the use of thermal imaging cameras during size-up. The observation of an acquired structure burn found the use of thermal imaging cameras for size-up to be beneficial if a color mode was available. The recommendations were to implement thermal imaging camera usage during size-up and three other operational recommendations were also made. An observation should also be performed on buildings with platform frame and lightweight concrete and steel construction. Future readers should look to fire departments outside of Wisconsin for guidelines on thermal imaging cameras.