I am very pleased to play even a small part in the publication of this book on the SIGNAL language and its environment POLYCHRONY. I am sure it will be a s- ni?cant milestone in the development of the SIGNAL language of synchronous computing in general and of the data?ow approach to computation. In data?ow the computation takes place in a producer-consumer network of - dependent processing stations. Data travels in streams and is transformed as these streams pass through the processing stations (often called ?lters). Data?ow is an attractive model for many reasons not least because it corresponds to the way p- duction transportation andcommunicationare typicallyorganizedin the real world (outside cyberspace). I myself stumbled into data?ow almost against my will. In the mid-1970s Ed Ashcroft and I set out to design a super structured programming language that we hoped would radically simplify proving assertions about programs. In the end we decided that it had to be declarative. However we also were determined that iterative algorithms could be expressed directly without circumlocutions such as the use of a tail-recursive function. The language that resulted which we named LUCID was much less traditional then we would have liked. LUCID statements are equations in a kind of executable temporallogic thatspecifythe (time)sequencesof variablesinvolvedin aniteration.