The model in Figure 1 also highlights the role played by another
set of IT variables: the technical outcomes achieved by the SPMS.
Technical outcomes include the usefulness and effectiveness of
the SPMS. The literature in management information systems
defines usefulness as the degree to which a person believes
that using a particular system would enhance performance [43]
and relates it to voluntary IS use [12, 13]. The actual use of
an information system is seen in the literature as an important
indicator of IT success and has been found to be strongly related
to the perceived usefulness of the system [31]. Prior IS research