1.8} MAIN DIFFERENCES BETWEEN FLUKA AND EARLIER CODES WITH SAME NAME

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 The history of FLUKA, spanning more than 40 years, is narrated in detail in
 Chap. 18}. It is possible to distinguish three different generation of
 "FLUKA" codes along the years, which can be roughly identified as the FLUKA
 of the '70s (main authors J. Ranft and J. Routti), the FLUKA of the '80s
 (P. Aarnio, A. Fasso`, H.-J. M"ohring, J. Ranft, G.R. Stevenson), and the
 FLUKA of today (A. Fasso`, A. Ferrari, J. Ranft and P.R. Sala).

 These codes stem from the same root and of course every new "generation"
 originated from the previous one. However, each new "generation" represented
 not only an improvement of the existing program, but rather a quantum jump in
 the code physics, design and goals. The same name "FLUKA" has been preserved
 as a reminder of this historical development - mainly as a homage to J. Ranft
 who has been involved in it as an author and mentor from the beginning until
 the present days - but the present code is completely different from the
 versions which were released before 1990, and in particular from the last one
 of the second generation, FLUKA87 [Aar86, Aar87].

 Major changes and additions have affected the physical models used, the code
 structure, the tracking strategy and scoring. Important additions, such as a
 wider range of biasing possibilities and some specialised tools for
 calorimeter simulation, have extended the field of its possible applications.

 An exhaustive description of all these changes and new features along the
 years is reported in Chap. 18}. However, the best gauge of the program
 evolution is probably the widening of the application fields, and the boost
 of its recognition and diffusion all over the world.

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