A Psi-rating comes through training and examination of a person's
skills over time. Ivanova's mother never went through the full sequence
to get rated. (Although they generally don't bother with P1s through
P2s, so she was at least a P3 or above, in terms of raw ability.) A psi
rating isn't hereditary.

jms

Enquiring minds that want to know, will...in the fullness of time.

jms