Metaphilosophy (sometimes called philosophy of philosophy) is "the investigation of the nature of philosophy". Its subject matter includes the aims of philosophy, the boundaries of philosophy, and its methods. It is considered by some to be a subject apart from philosophy, while others see it as automatically a part of philosophy, and still others see it as a combination of these subjects. The interest in metaphilosophy led to the establishment of the journal Metaphilosophy in January 1970.