Development of software for the hard real-time controller using feature-oriented reuse method and CASE tools

Elevator control systems are very sophisticated, hard real-time systems that have to do various activities within specified timing constraints. Also they have numerous differences of functions and system specifications due to adopting user's requirements. So, it is difficult to develop new models especially on requirement changes with satisfying timing constraints. A new software development process focused on software reuse is introduced. This process has been applied from the first phase of the software life-cycle. It is called feature-oriented reuse method (FORM). Using FORM, we could describe those complicated elevator systems in more understandable form, utilize reusability of requirement specifications, adopt new requirements, and finally develop reliable control systems. This paper present real-time elevator model resulted from each software development process for the elevator controller and promising simulation results showing dynamic behavior.