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Researchers looking for ways to change the insecure behaviour that results in phishing have considered multiple possible reasons for such behaviour. Therefore, the purpose of this paper is to understand the role of optimism bias (OB – defined as a cognitive bias), which characterises overly optimistic or unrealistic individuals, to ensure secure behaviour. Research that focused on issues such as personality traits, trust, attitude and Security, Education, Training and Awareness (SETA) was considered.

This study built on a recontextualized version of the theory of planned behaviour to evaluate the influence that optimism bias has on phishing susceptibility. To model the data, an analysis was performed on 226 survey responses from a South African financial services organisation using partial least squares (PLS) path modelling.

This study found that overly optimistic employees were inclined to behave insecurely, while factors such as attitude and trust significantly influenced the intention to behave securely.

Our contribution to practice seeks to enhance the effectiveness of SETA by identifying and addressing the optimism bias weakness to deliver a more successful training outcome.

Our study enriches the Information Systems literature by evaluating the effect of a cognitive bias on phishing susceptibility and offers a contextual explanation of the resultant behaviour.

THE Manchester School of Librarianship was founded in October 1946, one of the original five schools opened in the autumn of that year. It was attached to the Department of Industrial Administration in the Manchester College of Science and Technology and was thus something of an exception, as the majority of schools of librarianship were attached to Colleges of Commerce or general Colleges of Further Education. As accommodation was very limited in this rapidly expanding college, the then City Librarian of Manchester, Charles Nowell, kindly offered the use of two rooms in the Central Library, so after a brief period in the College building, the students were moved to the Central Library, though the School remained administratively a part of the College. Many former students must have memories of those two curving rooms, the Manchester Room and the Lancashire Room, with their old‐fashioned school desks.