In the new tenth edition the text in almost all the chapters has been updated by adding new materials and deleting the old ones. New problems with their solutions have been added. By working through these examples, the students are likely to develop their skills in analyzing spectral data to solve problems. More new problems with their solutions have been added in chapter four while the old ones have been deleted. The major aim has been to develop strategy in solving problems from spectral data. The above updation and revision would greatly help students in competitive examinations like NET, etc.