Several architecture models in the IS have been developed [46]. The Architecture
of Integrated Information Systems [47] includes organization, function,
data, and processes. The Zachman [48] and TOGAF [49] are more generic—
layered—frameworks. The first is structured using the categories of scope,
enterprise model, system model, technology, and detailed representations. The
latter employs the dimensions of business architecture, application architecture,
data architecture, and technology architecture.
Comparing these approaches, Aier et al. [50] distilled four layers for a sound
architecture design2: strategy, organization, business/IT alignment, and IT support
(software and IT infrastructure). We use this structure as the starting point for both
our survey (next section) and the redesigned EIS architecture developed to address
the requirements it identified (section following the discussion of the survey).