In continuation of the earlier book on spectrophotometric methods for iron and copper the present book is the next attempt for covering methods and reagents for single as well as simultaneous Spectrophotometric determination methods for the two most important industrial and biologically useful metals Ni and Co. The book is an extremely helpful single source handbook for researchers, analytical chemists in industry as well as post graduate students in academic institutions. It covers methods developed during the last 20 years and gives very brief descriptions as a Do-It-Yourself Guide in simple and precise language.