A method of generating a second customised document incorporating amendments made to a previously generated first document, where the customised documents include one or more selected predetermined portions of document content, comprises the steps of: determining which portions of document content are comprised in the first document but which are not comprised in the second document; deleting the portions of document content determined in the preceding step from the first document; determining which portions of document content are comprised in the second document but which are not comprised in the first document; and copying the portions of document content determined in the preceding step from the second document to the first document.