* Business Skilled (a.k.a. "Subject Matter Expert" or "SME"): Understands business needs in-depth, spotty knowledge of technology, no coding knowledge

* Tester Skilled: Understands discipline of testing and test development, spotty knowledge of scripting/coding

* Developer Skilled: Understands software development practices. Proficient coder. Usually NOT skilled in the discipline of testing!

* Guru: Understands software development practices in-depth at the strategic and tactical level. Also understands test practices in-depth. Gets the "Full-Picture".