"ActiveSpec is a Ruby implementation of the Specification pattern. It was born out of the desire to implement more complicated validations than the built-in Ruby On Rails validations macros allow and can be used with both Rails and non-Rails applications.

"communication is the most important aspect of agile way, so DDD is a nice counterpart concept to TDD"

Rails does allow for TDD, but doesn;t allow for test-first, unless I'm missing something obvious...

Not PDFs.