1. The heirs of a person who is still alive are unAscertained.

2. Under the various Sale of Goods Acts property in unAscertained goods does not pass until the goods are Ascertained.

3. Based on the uncertainty information handling mathematics-theory, we put forward unascertained quantification and a series of its quality on expert idea.

4. So the problem of Alienability of contingent remainders and executory interests, where the taker is unascertained, is necessarily restricted to cases where there is a prospective taker who answers the description.