During the SPIE Institue meeting a lot of consideration was given to the "Black Box Model", the concept that one has during medical application of laser radiation, a box which contains the biological tissue with all its parameters and properties, very often including even environmental influences. Laser radiation is fed into this box as an input and the output is the medical result. The discussions showed that too much is put into the black box, so that the proper description of the effects taking place in the biological tissue, the basis for their understanding, is not possible. It is therefore important to specify as far and as exactly as possible the parameters which may influence the result of a medical treatment and to use internationally recognized terms and units which are unambiguous, to describe them.
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