By Fred Shaffer. Provides a current and extensive review for the BCIA Certification Exam in Biofeedback. The content for this web-based service was developed by Biosource Software, the leading creator of educational software for biofeedback professionals. This service allows you to take 20-question multiple-choice exams and receive immediate feedback on your performance. All you need to use Biofeedback100 is a web browser and an internet connection.