This book has been designed to improve the methodology of EIA that involved uncertainty and impreciseness during prediction of it's parameter.The parametric information or data available from the periphery of a project are not always crisp or precise, rather linguistic & hedges.Most of the data are nonnumeric, viz. "good,""very good,""low,""high,""less,""big," "poor,"etc. which are fuzzy data.Naturally every decision maker hesitates more or less on every evaluation activity.At present there is no tool available to an engineers or experts by which these uncertainties can be eliminated or...