Hello maged mmh:
All tables are conservative in that they will protect all but the most sensitive diver on his worst day. The PADI RDP was tested in both a hyperbaric chamber, in the open water, and in a multiday trial. All of these were done using a Doppler bubble detector. The methods and results were presented at scientific meetings and the references are below. I was the individual (MRP) in charge of the test program.
One always has the option of adding time to a table format and producing something that is more conservative.
Dr Deco :doctor:
References
MR Powell and R Rogers. Gas phase formation as detected by Doppler ultrasound in
divers performing multilevel and repetitive dives. The Physiologist, 30 (4), 134, (1987).
MR Powell, MP Spencer, and RE Rogers. Doppler ultrasound monitoring of gas phase formation
in divers performing multilevel and repetitive dives. Undersea Biomed. Res. 15, Suppl., 84-85 (1988).
R Rogers and MR Powell. Development of multilevel and repetitive tables for
recreational divers. Undersea Biomed. Res., 15, Suppl., 84 (1988).
MR Powell, and RE Rogers. Doppler ultrasound monitoring of gas phase formation and
resolution in repetitive diving. Undersea Biomed. Res., 16, Suppl., 69, (1989).
Hamilton, RW, RE Rodgers, MR Powell, and RD Vann. Development And Validation Of
No-stop Decompression Procedures For Recreational Diving. Diving Science and
Technology. (Pp. 78 + appendix). February 28, (1994)