Organithms: the dynamics of software evolution

Summary form only given, as follows. No software system is static. A useful one evolves rapidly: the greater the number of users, the more rapid the change. How does one design for change? How does one treat specification dynamically? The issues that must be treated are local and global prototyping, rapid reconfiguring, and the control of function access and diffusion. What are the properties of an implementation language that are crucial? Why is a Lisp-based implementation language preferable to Ada? Does machine architecture play an important part? Can one separate portability from evolution?.<>