Wills vary from extremely simple single-page documents to elaborate volumes, depending on the estate size and preferences of the person making the will (the "testator"). Wills describe the estate, the people who will receive specific property (the "devisees"), and even special instructions about care of minor children, gifts to charity, and formation of posthumous trusts. Many people choose to disinherit people who might usually be expected to receive property. For all these examples, the testator must follow the legal rules for wills in order to make the document effective.