The examiner is an open type test system. Users gave a free hand with answers' formulating. A teacher must formulate questions and answers. Users will not see the answers and must formulate it by themselves. The answers consist of keys each of which may be a sentence, a combination of words, a word, a part of a word, etc. Right answer for a question must content all of keys. Each key gives user an appointed mark. All keys can have one or more variants. A mention of one of variants is enough for user to have a mark.