Developments in Biology, Economy, Information Technology, Social studies etc have introduced and acknowledged the understanding that the whole world consists of Information Processing Systems (IPS). We understand rather well computations in man-made devices, especially in computers, and how these computations change the (logical) state of the world (pre- and post-conditions). But we do not have general model of computations which occur in natural IPS – living organisms and its subsystems, businesses, languages, social systems etc and how these computations change the environment where they proceed.

Here is proposed a unified view of computations occurring in different Information Processing Systems and clarified notions of Data and Information; the view is based on Entropy. While IPS (e.g. living systems) are capable reducing their inner entropy during their limited existence (none of them are immortal), the final result of their existence is increase of Entropy; Life is (possibly) the greatest factor increasing entropy on Earth.