Editorial

Dear Readers,

This issue includes a book review by Charles Ashbacher. We welcome his work back. The special features include six columns by our regular columnists. As always I greatly appreciate the efforts by these busy professionals.

Our five feature-length papers cover a wide gamut of subject matter from multiple garbage collection servers, the UML representation of concurrent reactive systems, dynamic un-typed object-based inheritance to the Panda and Timor programming systems.

Hope you enjoy this installment and find it useful.