Weaver's memorandum has triggered immediate action from the part of other MT specialists. One of the first people on the scene was Erwin Reifler, mentioned in the memorandum itself. In his study carried out in January 1950, he put forward the idea of pre- and post-editing with the assumption that fully automated translation can only be done on the basis of word-for-word substitutions, which would cause inadequacies and errors in the generated translation. His suggestion for eliminating the problem was implementing a human pre-editor with the knowledge of the output language, who would add additional symbols for grammatical, lexical and logical correctness. The post editor, in turn, would have the task of rendering the text generated by MT reasonable and logical; ideally, he would have the knowledge of the source language.