employees and their relations.
is not’ test was appropriate for discretionary trusts as well.
are concerned only with conceptual uncertainty,
not evidential uncertainty.
considering exercise of discretion, trustees should (per Lord Wilberforce in McPhail) make a survey of the entire
field of objects, and consider each individual case on its merits.
discover identities of all possible beneficiaries, administrative problems.
fail if class is so widely drawn as to be administratively unworkable.
class of beneficiaries cannot be ascertained?