The Original subject of this thread was PADI vs. SDI
To the point:
Do the agency standards require the teaching of dive tables?
PADI - No, The instructor has the option of either teaching the use of PADI tables (RDP) or the use of a special purpose hand calculator (eRDP) for dive planning.
SDI - No, The instructor must teach the use of a dive computer for dive planning, execution and post-dive record keeping (logging).
May the instructor teach dive tables?
PADI - Yes. PADI tables are in the student manual.
SDI - Yes. US Navy tables are in the student manual.
May the instructor require the student to demonstrate the ability to use dive tables as a condition of certification?
PADI - Yes
SDI - Yes
Does the agency require the teaching of the use of dive computers?
PADI - No
SDI - Yes
May the instructor teach the use of dive computers?
PADI - Yes, but there is no outline for such teaching in the student manual or in the instructor manual.
SDI - Yes, it is part of the course outline.
May the instructor require the student to demonstrate proficiency in the use of a dive computer as part of the requirements for certification?
PADI - No.
SDI - Yes, in fact, it is a standard.