Others, noting that " different authors ( in both research literature and in textbooks ) define different phases of the design process with varying activities occurring within them, " have suggested more simplified / generalized models-such as " problem definition, conceptual design, preliminary design, detailed design, and design communication ".
22.
A next step in IS modeling was taken by CODASYL, an IT industry consortium formed in 1959, who essentially aimed at the same thing as Young and Kent : the development of " a proper structure for machine independent problem definition language, at the system level of data processing ".
