Summary: The paper aims at embedding some physical properties of surroundings into the STRIPS system via the so-called operators of the world. By employing such operators a new factor is introduced considerably complicating the solution, and enlarging the space of the problem. A method is suggested which allows a real operator to be derived. It is a case of an operator whose application to a model of the world is adequate to the changes arisen through the respective robot action in a real surroundings represented by this model.