Seeking info about the theory of patterns and pattern language [closed]

1. What is pattern language theory?
2. How many patterns are there in pattern language?
3. What is Alexander's view of how do you use patterns?

What is pattern language theory?

The pattern language is a set of inherited tried-and-true solutions that optimize how the built environment promotes human life and sense of wellbeing. It combines geometry and social behavior patterns into a set of useful relationships, summarizing how built form can accommodate human activities.

How many patterns are there in pattern language?

While A Pattern Language contains 253 "patterns" from the first pattern, "Independent Regions" (the most general) to the last, "Things from Your Life", Alexander's book The Timeless Way of Building goes into more depth about the motivation and purpose of the work.

What is Alexander's view of how do you use patterns?

“Each pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice” (Alexander et al.