The requisite intention to make a will, which involves the intention of making the particular document one signs one’s last will and testament to operate as provision for disposing of one’s property and other administrative arrangements to take effect on death. A document purporting to embody the testamentary intentions of a deceased person can, notwithstanding that it has not been executed in accordance with the specified formalities of signing and witnessing, be deemed to be duly executed if, upon application, the court is satisfied that there can be no reasonable doubt that the document embodies the testamentary intentions of the deceased person: Wills Ordinance (Cap 30) s 5(2). A valid will must embody the testamentary intention of the deceased, meaning that it must be testamentary, ambulatory and revocable and it must not take effect until death: Re Leung Wai Jing [2004] 1 HKC 453. An instrument cannot be a provable will unless the maker had an animus testandi, which means that the maker must intend that his document shall take effect as a revocable ambulatory disposition of his property which is to take effect on death. The document, in whatever form, must disclose the intention of the maker respecting the posthumous disposition of his property: Sherrin et al, Williams on Wills (8th Ed, 2002, Butterworths) ch 10 para [10.4]. Also known as ‘animus testandi’. See also ; Dispensing power; Formalities; Testamentary capacity.
訂立遺囑時所需的意願，涉及以下的意願：致使該特定文件作為已簽署的最後遺囑，及致使遺囑作為處置其財產及於立遺囑人去世時生效的其他行政安排的條文運作。任何看來是體現立遺囑人遺願的文件，即使未有按照第(1)款所述規定訂立，但只要有人提出申請，而法庭在無合理疑問的情況下信納該文件是體現立遺囑人的遺願的，則該文件須當作已妥為簽立：《遺囑條例》（第30章）第5(2)條。有效的遺囑必須載錄死者的立遺囑人遺願，意指該遺囑必須屬遺囑性、可變動的及可撤銷的，及該遺囑必須在立遺囑人去世時方可生效：Re Leung Wai Jing [2004] 1 HKC 453。某文件不可作為可予證明的遺囑，除非其擬備人有訂立遺囑的意圖，即指該擬備人必須有意使其文件作為其財產的可撤銷及可變動的產權處置書而生效，及於其去世時方可生效。該文件（以任何形式擬備）必須披露該擬備人就去世後其財產的產權處置的意圖：Sherrin et al, Williams on Wills（第8版，2002年，Butterworths）第10章，第[10.4]段。另稱「訂立遺囑的意圖」。另見 Dispensing power; Formalities; Testamentary capacity。

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