A still wider interpretation of equal opportunity norms extends the domain of equal opportunity to all domains both public and private. Call this universal equal opportunity.  Formal universal equal opportunity obtains in a society if and only if in any and all interactions among members of society, partners and participants for interaction are selected according to relevant criteria, depending on the nature of the interaction proposed. Substantive universal equal opportunity requires that all members of society have substantial opportunity to develop traits that would render them eligible for any type of interaction they might seek, and universal fair equality of opportunity (FEO) is defined in a similar way.