er rivals along the whole industry value chain. Generic strategies have been proposed. Despite the usefulness of these frameworks applied to the search for competitive advantages, these frameworks are market-oriented, and are not suitable to explain SIS developed in other non-market-oriented industries, such as government. Another deficiency of these frameworks is the concentration on competitive advantage to the exclusion of other perspectives. As a result of industry-wide adoption of SIS, the questions of sustainability of competitive advantage and of competitive necessity arise. This in turn leads to cooperative arrangements, including alliances, and at a more abstract level, collaboration. IT has become a significant factor in the operation and planning of information-based enterprises. Strategic information systems theory has done much to enable the description, explanation and prediction of behaviour. There remain significant weaknesses which need to be addressed. ...
