I have never seen anything called PDP process, given you are claiming such a thing exists, please educate us about it. What does it consist of, how is it structured, what are preceding activities, what happens after this "PDP process", which part of the Gate review does it lie in?
Feasibility phase > PDP > DDP > FSED I > FSED II
Too bad you've never heard of it, but ADA uses it.
https://cag.gov.in/webroot/uploads/download_audit_report/2015/Union_Performance_Defense_Design__Manufacture_Light_Combat%20Aircraft_17_2015.pdfThe Project Definition Phase (PDP) document of LCA prepared by ADA (December 1988) had been reviewed by Air HQ (March 1989) who found it deficient in the crucial parameters of aerodynamic configuration, volume and weight as set in ASR, particularly with reference to significant increase in weight of LCA, which could adversely affect performance.
HAL uses the term Preliminary Design Phase.