In a computer model, Whitehead found that
a theoretical cultural behavior that gives a 10 % reproductive advantage and is passed to 95 % of daughters will reduce mtDNA diversity to almost zero in 300 generations.
For the areas of
Theoretical Foundations (including pregnancy & early parenthood; infant / very young child development &
behavior; attachment, separation, trauma, & loss;
cultural competence; etc.) and the areas of Direct Service Skills (including observation & listening; screening & assessment; etc.) competency must be documented by course work and / or in - service training.