The Physical Attributes/ Particle Size WG is discussing test methods and specification-setting for particles of active pharmaceutical ingredients in oral dosage forms.
ICH Q2A http://www.fda.gov/cder/guidance/ichq2a.pdf
ICH Q2B http://www.fda.gov/cder/guidance/1320fnl.pdf
ICH Q6A http://www.fda.gov/OHRMS/DOCKETS/98fr/122900d.pdf
Work Plan
Drug Substance Particle Size Work Plan (PDF)
Meeting Minutes