One of the most critical factors of room acoustic behavior is the measurement of Reverberation Time.  Reverberation Time can be measured using real time analyzers by measuring time response of impulse tone in the surveying room at a frequency bandwidth at specific OBCF (octave band centre frequencies) or 1/3 band frequencies. This method is used by engineers for pre or post verification reasons. When a room design has not been constructed yet the Reverberation time can be predicted using the Acoustic design software by creating  the corresponding room acoustic model.