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+ Recursive subroutines should be reentrant

+ In computer science, concurrency is a property of systems in which several computations are executing simultaneously, and potentially interacting with each other.

+ To be reentrant, code must have no global variables, no locks on singleton resources and must not rely on non-reentrant code

+ Canonicalization converts data that has more than one possible representation into a standard representation.

+ idempotent means that multiple identical requests should have the same effect as a single request.

+ Make sites work for users not against them by doing user testing

+ Concurrent systems find reliable techniques to minimize response time and maximize throughput.

+ Concurrent use of shared resources can be a source of indeterminacy leading to issues such as deadlock, and starvation.

+ Concurrency is when several computations are executing simultaneously, and potentially interacting.