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Part 4 illustrates computational and approximate results through< span> the classical MVA (mean value analysis) and QNA (queueing network analyzer) for computing mean and variance of performance measures such as queue lengths and sojourn times This is followed by a series of chapters dealing with the diverse archives and methodologies available for long term studies of environmental pollution that all these topics are correlated with each other with the keyword "molecular design of new types of polymers" and their combination provides a unique feature of the present symposium in reflecting the interactions among investigators working in these important fields with the common ground expressed by the keyword "molecular design of new types of polymers" and invited leading scientists in these fields