The proceedings of a seminar held at TWI in September, 1995, focusing on crack arrest philosophy which aknowledges that a brittle crack is arrested when it emerges from the critical region. Papers from prestigious researchers presented a critique and assessment of the theory and its application under: Introduction to crack arrest concepts; Recent trends in crack arrest research; Application of crack arrest concepts. Intended for those who have to apply or teach design skills in a technical or engineering context, this resource book defines and explains eight creative thinking techniques and shows how to use and adapt these to solve design problems. Case studies are drawn from a wide range of applications.