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The three certainties compose a rule within English trusts law on the creation of express trusts that, to be valid, the trust instrument must show certainty of intention, subject matter and object. "Certainty of intention" means that it must be clear that the donor or testator wishes to create a trust; this is not dependent on any particular language used, and a trust can be created without the word "trust" being used, or even the donor knowing he is creating a trust. Since the 1950s, the courts have been more willing to conclude that there was intention to create a trust, rather than hold that the trust is void. "Certainty of subject matter" means that it must be clear what property is part of the trust. Historically the property must have been segregated from non-trust property; more recently, the courts have drawn a line between tangible and intangible assets, holding that with intangible assets there is not always a need for segregation. "Certainty of objects" means that it must be clear who the beneficiaries, or objects, are. The test for determining this differs depending on the type of trust; it can be that all beneficiaries must be individually identified, or that the trustees must be able to say with certainty, if a claimant comes before them whether; they are or are not a beneficiary.

There are four categories of uncertainty that can affect the validity of a trust: conceptual uncertainty, evidential uncertainty, ascertainability and administrative unworkability. "Conceptual uncertainty" is where the language is unclear, something which leads to the trust being declared invalid. "Evidential uncertainty" is where a question of fact, such as whether a claimant is a beneficiary, cannot be answered; this does not always lead to invalidity. "Ascertainability" is where a beneficiary cannot be found, while "administrative unworkability" is where the nature of the trust is such that it cannot realistically be carried out. Trustees and the courts have developed various ways of getting around uncertainties, including the appointment of experts to work out evidential uncertainty, and giving trustees the power to decide who is or is not a beneficiary. (Full article...)