Earlier models of technology adoption come with criticism. For example, in terms of the Theory of Reasoned Action (TRA), irrational decisions, habitual actions and other unintentional behaviours are not explained (Ajzen & Fishbein, 1980; Fishbein & Ajzen, 1975). TRA is also limited by its reliance on self reported information to determine the subject’s attitude and the data reported may be subjective in nature (Ajzen & Fishbein, 1980; Farhoomand et al., 1990; Fredricks & Dossett, 1983; Tan & Teo, 2000). The Theory of Planned Behaviour (TPB) is also limited in that it describes the attributes of adoption at the individual unit of analysis rather then at the organisational level. This precludes its use when dealing with an adoption based on primarily, organisational units (Ajzen, 1985; Ajzen, 1991; Ajzen & Driver, 1992; Ajzen & Madden, 1986; Cheung et al, 1999; Madden et al., 1992; Randall & Gibson, 1991).