According to an article on about.com:
"The main difference between agencies is where they operate. Some agencies such as BSAC and CMAS are closely related to their countries of origin, while other agencies such as PADI are truly global organizations. All of the most popular agencies offer very similar courses from beginner through to professional level and will all recognize each other's qualifications at recreational level. They may not recognize each other's qualifications at professional level."
You can find the entire article at http://scuba.about.com/od/profession...rtagencies.htm
You can also send an email to CTI and ask them, but be patient on a response as they don't get back to you quickly.
Juliann & Jeff
Jamaica Soon Come