TASEF (Temperature Analysis of Structures Exposed of Fire) is a computer program for calculating temperatures in structures exposed to fire. The temperature distribution is obtained by a numerical scheme based on the finite element method. Two-dimensioned and axisymmetrical structures may be analyzed. The input data to TASEF may be specified by using the input program INTASEF. This user's manual contains a description of the TASEF program and the theory behind as well as user's instructions for the TASEF and INTASEF programs.