Decision support systems are oriented towards the solution of specific problems, and frequently involve modelling. Using this approach, more or less theoretically 'optimal' solutions can be produced, depending on the comprehensiveness and validity of the model used. Decision support systems appear most relevant to functional experts and professionals who generally deal with relatively well-defined problem areas, and they may or may not be connected to the corporate database. Process-oriented decision support systems provide tools that can facilitate the process through which decision-making takes place. Built on generalised problem-solving principles, this type of system presents the user with a series of steps or stages which the user may or may not utilise in reaching the final decision. 'Office automation' systems provided access to functions such as calendaring, word processing or electronic mail, while 'status access' applications simply gave the executive the facility to access a variety of preformatted reports through the terminal.