Other useful parameters

You might also consider the following data to be part of your speaker profiles:

• Mother tongue of speaker
• Second languages of speaker
• Mother tongue of parents
• Second languages of parents
• Pathologies
• Dentures
• Piercings
• Place of elementary school
• Dialect region (difficult)
• Dialect (even more difficult)
• Level of education
• Level of proficiency for a certain task
• Profession (very hard to code)
• Height (including measuring unit)
• Weight (including measuring unit)
• Left/right handed, ambivalent
• Smoker/non smoker
• Stutter
• Hearing status
• Free comments

Most probably you will have to define other, more specific coded speaker characteristics depending on your special needs.