By presenting state-of-the-art research results on various aspects of formal and visual modeling of software and systems, this book commemorates the 60^th birthday of Hartmut Ehrig.

The 24 invited reviewed papers are written by students and collaborators of Hartmut Ehrig who are established researchers in their fields. Reflecting the scientific interest and work of Hartmut Ehrig, the papers fall into three main parts on graph transformation, algebraic specification and logic, and formal and visual modeling.