For Intro/Introductory course read Basic course - this is a combination of the old Intro course and Radar Skills.
The courses currently go like this:
Basic Course
All do this (3 months); it ends in theory exams, summatives (practical assessments) and a mock oral board.
Then you get to fill in your preference of discipline based upon the company's requirements. You might or might not get your preferred choice.
Then you do as follows:
All airports people do 2 weeks / 15 hours flying training.
Aerodrome-only
10 week course with regular summatives, several written exams and an oral board.
TC Approach
Aerodrome familiarisation (1 week); written exam.
12 or 16 week course with one exam, two sets of summatives and an oral board.
Regional Airport
Basically does Aerodrome followed by Approach as above (minus the TC Approach Aerodrome famil. week).
Area
Area Foundation: roughly 3 months with a theory exam, an oral board and one set of summatives
Area Advanced: roughly 3 months with a theory exam, an oral board and one set of summatives.
Finally all disciplines do the 1 week BA Airline Ops Familiarisation course, then posting. Sometimes people have to be brought back from their units to do the BA course as they run quite infrequently and you could have already been posted by the time one comes up.