Classification topics are topics, which should be created in order to give students possibility to write many classification essays. In order to give students such possibility, it is necessary to think a lot about possible classification topics. First, it is necessary to think about subjects, which can be classified. In general, a lot of things can be classified if you manage to find criteria according to which it is possible to build classification. Classification is such structured system, which includes several types of one thing. In other words, you have certain object and you have to find criterion or condition according which you will be able to find several variants of types of one thing, which is subject of the classification essay. In fact, to compose classification topics is not a difficult thing. It is difficult to compose the classification itself after receiving the classification topic. For example if you have to write classification essay about mobile phones, then you can find several criteria according which it is possible to compose classification. If your criterion is a form of mobile phones, then your classification will include candybar phones, clamshell phones, swivel phones and slide phones. Other criterion of mobile phones is the domination of certain device in the phone. According to this criteria mobile phones are divided into camera-phones, where main attention is pain of photo and/or video camera: smart-phones – mobile phones with features of PC, they have operating systems like Symbian OS, Windows Mobile, Palm OS, GNU/Linux; PDA (personal digital assistant) are handhelp computers with functions of mobile phone.