Clean Architecture

Architects Registry Exam
371
involved having the candidate solve a number of architectural problems 
involving building design. The candidate might be given a set of requirements 
for a public library, or a restaurant, or a church, and then asked to draw the 
appropriate architectural diagrams.
The results would be collected and saved until such time as a group of senior 
architects could be gathered together as jurors, to score the submissions. 
These gatherings were big, expensive events and were the source of much 
ambiguity and delay.
NCARB wanted to automate the process by having the candidates take the 
exams using a computer, and then have another computer do the evaluation 
and scoring. NCARB asked ETS to develop that software, and ETS hired me 
to gather a team of developers to produce the product.
ETS had broken the problem down into 18 individual test vignettes. Each 
would require a CAD-like GUI application that the candidate would use to 
express his or her solution. A separate scoring application would take in the 
solutions and produce scores.
My partner, Jim Newkirk, and I realized that these 36 applications had vast 
amounts of similarity. The 18 GUI apps all used similar gestures and 
mechanisms. The 18 scoring applications all used the same mathematical 
techniques. Given these shared elements, Jim and I were determined to 
develop a reusable framework for all 36 applications. Indeed, we sold this idea 
to ETS by saying that we’d spend a long time working on the first 
application, but then the rest would just pop out every few weeks.
At this point you should be face-palming or banging your head on this book. 
Those of you who are old enough may remember the “reuse” promise of 
OO. We were all convinced, back then, that if you just wrote good clean 
object-oriented C++ code, you would just naturally produce lots and 
lots of reusable code.
So we set about to write the first application—which was the most 
complicated of the batch. It was called Vignette Grande.
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