From the reviews: "The book under review summarizes the recent research on simultaneously perturbation problems. ... The book provides a coverage of the known material in stochastic optimizations, such that both researchers and practitioners should find it useful. The text is well understandable, the book is clearly written and impressively printed. Theorems and algorithms are emphasized in coloured frames. Therefore, the book can be used as material for lectures dedicated to master students. ... There are references at the end of every chapter." (Werner H. Schmidt, Zentralblatt MATH, Vol. 1260, 2013)