how to execute document witness
Companies signing legal documents. A company can execute a document in any way that it determines, including authorising a person to sign the document on the company's behalf. The form of execution needs to be supported by either a provision in the company's constitution or a resolution of the company's board.o keep things simple, as a general rule a witness to the execution of a legal document should: 1  be 18 years old or older; 2  know the person whose signature they are witnessing; 3  be satisfied as to that person's identity; 4  not be a party to the document, that is, they should be signing the document only as a witness.