This knowledge, referred to as the "idea student" model, consists of approximately 500 IF-THEN rules for writing LISP
Significant blocks of time must be allocated to identify an apppriate problem for the prototype, investigate the various system building tools available (fortunately there are only three or four to consider), analyze the available LISP
machine/workstation options (there are many), and select the consultant(s) to be hired to educate the project team in the knowledge engineering skills needed to build the demonstration prototype.
Alvarez admits that the DIY ethos of the Lisps helped them leapfrog the traditional musical theatre development process.
Some mild lisps will improve after only a few weekly sessions, while others may continue to improve over several months or even years.
Stock hardware Lisps use generational versions of mark-and-sweep or stop-and-copy, and Zorn  has shown the performance of both styles to be quite similar.
In the past few years, PC-based Lisps have been getting smaller and quicker while PCs have been getting larger and faster, enabling PC Lisps to help solve the developer's delivery problem.