The book contains comprehensive study on intelligent techniques used in design of an intelligent gas recognition system. Authors have mentioned statistical technique and neural network technique in designing of such intelligent gas recognizer. The neural network techniques include classical backpropagation algorithm and hybrid neuro genetic approach. The book provides detailed study on experimental procedures, data collection methods, data preprocessing techniques etc. in course of such intelligent system design. Interesting aspect of this book is its way of presenting various intelligent techniques. Book is offering performance analysis of intelligent techniques with discussion on their respective computational complexity. The book is useful for under graduate, post graduate, and research students in the applied field of science, engineering and technology.