 The ‘objectivist’ interpretation of the BIP is beset by a number of difficulties. Some urge that what is best for any child is necessarily indeterminate. There certainly is no fact of the matter in this regard for we must attach values to the options and their outcomes in respect of any choice of action towards a child. However it will be said that independently of questions of value we cannot, with certainty, determine what is best for a child. We cannot in practice make complete and accurate assessments of what will be the outcome of each and every policy option that we might adopt in respect of a child (Mnookin 1979). How can we know with certainty whether this child will flourish if raised by this set of parents rather than by some others in an alternative setting? Even where we are seeking to rank the outcomes of the options within a simple custody dispute between mother and father things may prove impossibly difficult. After all, any number of things may happen if the child is in the mother’s custody, and the same is true if the child is given to the father. The BIP is indeterminate even where there are only two possible decisions to be made (Elster 1989, 134–139).