On the bright side, the text is well written in American English with few typographical errors. Its text is full of worked examples, figures, graphs and tables with actual results of approximations. The problems at the end of each chapter help the reader to become familiar with the techniques, in a practical way. There are also computer programs for the reader, to practice, that is reusable source code in c, FORTRAN and for other tools, common nowadays, such as Maple, etc.
On the dark side, there are no proofs of theorems, which are of theoretical interest, especially to the mathematicians.
All in all, the book is a huge success, now at the 7th edition, suitable for engineers, or readers fond of the practical view of mathematics.