As a foreword, here we publish an email letter of Late Professor Herb
Simon, Nobel Laureate, that he wrote on the occasion ofthe death of the
fatherofa friend. This letterofcondolence, more than any other wisdom,
tells about the essence of the process of scientific creation, which is
so important for both, the specific subject being covered by this book,
and for the general science. When asked to address an SSGRR conference
in Italy, prior to his death, Professor Herb Simon agreed that these
lines be presented to all those who are interested in understanding the
real essence oftheir own scientific struggle. Dear Professor
Milutinovic: I want to extend my deepest sympathy to you and your family
on the death of your father. His career was a very distinguished one,
and his life spanned a most complex and difficult sequence of epochs in
your country's history. Our generation (I am just a year younger than he
was), like all its predecessors, leaves many tasks - hopefully no more
than it inherited - for the next generation to take up; but even knowing
that it must be so does not remove one's senseofloss in the parting.