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Information quality and system quality are considered key factors in determining the usefulness of systems. However, prior studies have yielded mixed results. This article holds that the system's assistance (the degree of the assistance provided by a system through its two roles: automating and informating) mediates in this relationship and may help to explain such mixed results. Furthermore, it holds that the system's level of intervention (the degree to which technology participates in carrying out the tasks) is another key factor in determining its usefulness, especially through the automating role. Data from 246 users filling different hierarchies and functional areas were collected. Results show that information quality and system's level of intervention explain usefulness through both roles. System quality explains usefulness through the informating role, but not through the automating role. The factors' differentiated effects through each role may help managers to establish more effective criteria and priorities in the different stages of an information system's life cycle.

The adoption of natural gas increased notably last years, and there is some recognition that it improves the quality of life of inhabitants. While initial acceptance is an essential first step, the continued use is relevant to the long-term success of any technology. However, the literature on energy has focused on adoption and has devoted less attention to models that explain continuance usage. Accordingly, this study developed a model to explain continuance usage, grounded in Expectation-Confirmation Model (ECM). Unlike adoption models, confirmation of previous expectations and satisfaction with the experience of use have a relevant role in this phenomenon. Data was gathered through a questionnaire to 435 users of the service in a Latin American metropolis, and structural equations model was used for analysis. The results show that constructs of the ECM (perceived usefulness, disconfirmation, and satisfaction) influences on continuance intention. While the price impacts as expected, it is surprising that environmental consciousness strongly impacts the intention. These results may be useful for public agents to foster more comprehensive policies (beyond traditional: price and access), which include environmental and safety issues to consolidate the use of this energy source. Energy companies should develop strategies to manage consumer expectations and loyalty programs based on a high level of satisfaction.

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