This book is the result of research by a postgraduate' team consisting of the primary research results conducted by the author of this book and several postgraduate' students. The theme of this team's research is the Development of ICT-integrated Constructivism-based learning tools to improve Mathematical High-order Thinking Skills and soft skills for Junior High School Students. The primary researcher chose the theme of developing learning tools based on Discovery learning integrated with Microsoft Excel. Meanwhile, graduate students choose other constructivism-based learning models, such as PBL, RME, CTL, and others, by involving different software, such as Autograph, GeoGebra, Mathematica, and other types of soft skills. The results showed that although the increase in soft skills was not high enough, the improvement in MHOTS was quite significant.