- pdd00: Perl Design Documents
- pdd01: A high-level overview of the perl system
- pdd02: Common vtable format for all variables
- pdd03: Parrot Calling Conventions
- pdd04: Perl's internal data types
- pdd05: Opcode Function specs
- pdd06: Parrot Assembly Language
- pdd07: Conventions and Guidelines for Perl Source Code
- pdd08: Indexing Aggregate PMCs
- pdd09: Garbage Collection and Dead Object Detection
- pdd14: Big Numbers
- pdd15: Object and Class semantics for Parrot
- pdd16: NCI conventions and definitions
- pdd17: Parrot's basic PMC Types
- pdd18: Parrot's Security Infrastructure

