The first edition of this book "A Textbook of Preference Selection Index (PSI) and General TOPSIS in Manufacturing Environment" contains five chapters. This edition has been thoroughly presented and made on material selections and vendor selections. Some MCDM methods such as Preference Selection Index (PSI) and General TOPSIS Methods and Spearman's and Kendall rank correlation coefficient have been discussed for the solutions of some problems on material selections and vendor selections to choose the best alternative.