On the behalf of the Suan Sunandha Rajabhat University, Bangkok, Thailand, members of the International Program Committee of the ATCM conference, and the Institute for Promotion and Science and Technology of Thailand, we are honored to introduce the papers of the ATCM 2012 – “Creative and Critical Thinking in Mathematics Through Technology”. We are fortunate to have presenters from a wide spectrum of scientists and educators, whose presentations and workshops will demonstrate the most current trends in technology for mathematics and mathematics with technology. Papers and presentations address a very wide spectrum of topics and ideas. We can find papers concentrating on using computer software in teaching mathematics, papers on using Internet, multimedia, and other tools for interactive and online mathematics courses delivery, as well as research papers from pure mathematics where technology was used to produce some new results. Thanks to evolving technological tools, we are able to explore more interdisciplinary areas such as science, technology, and engineering with Mathematics which we could not before. Therefore, integrating technology into mathematics teaching, learning and research will definitely allow us to expand our knowledge horizon in mathematics. We encourage all authors and readers to contribute your new findings to our next ATCM or the Electronic Journal of Mathematics and Technology (eJMT: https://php.radford.edu/~ejmt/). We would like to express our appreciation to the local organizers, in particular to the Suan Sunandha Rajabhat University for the enormous task of planning and preparation of ATCM 2012 – one of the most enjoyable and instructive conferences in the World. We thank also the members of the International Program Committee and external reviewers for their great contribution in reviewing papers.