An interview from the Digimon Series Memorial Book: Digimon Animation Chronicle (デジモンシリーズ メモリアルブック デジモンアニメーションクロニクル) published on February 10, 2010 (between the airings of Digimon Savers and Digimon Xros Wars).
The book is a comprehensive compilation of Digimon anime series concept art and character/concept details, and is recommended as an extremely valuable resource especially for artists and cosplayers. As there is an incredibly large amount of text in this book, translating the entire thing would be a very difficult and borderline impractical task (although the very wonderful onkei has translated a very large chunk of it on her own blog). However, near the end of the book is a long and comprehensive interview with perennial series staff members Hiromi Seki, Hiroyuki Kakudou, and Yukio Kaizawa, which I felt would be of interest, so I have taken the liberty of translating it below.