Implementing electronic performance monitoring in the workplace might improve the efficiency and quality of employee data that are collected. These intended benefits might be discounted or even eliminated if employees have a negative reaction to the monitoring process. The goal of this exploratory study was therefore to investigate which electronic performance monitoring techniques and monitoring characteristics are associated with negative employee reactions using survey responses from 190 student workers. Results showed that close performance monitoring (via cameras, data entry, chat and phone recording) had significant negative effects on job attitudes such as job satisfaction and affective commitment. Similar effects were observed for employee self-efficacy and perceived control. Attitudes were furthermore negatively impacted when the monitoring was focused on individuals and unpredictable, which also reduced organisational citizenship behaviour while continuous monitoring reduced self-efficacy. These findings suggest that the benefits of close monitoring may be overshadowed by negative employee reactions.Keywords: performance management, electronic performance monitoring, job attitudes, employee development, organisational citizenship behaviour, computer monitoring.Electronic performance monitoring (EPM) is now commonplace in the modern workplace. Using EPM enables managers to assess employee behaviours that directly or indirectly relate to job performance. Nebeker and Tatum (1993) described EPM as the use of electronic instruments or devices to collect, store, analyse and report individual (or group) actions or performance (see Rafnsdóttir and Gudmundsdottir, 2011). EPM information is used to draw inferences about how effective and productive individuals, teams or larger departments perform their work (Stanton and Julian, 2002). It therefore represents a very important tool for how managers collect data about employee performance.Debora Jeske is a Research Associate in the Psychology and Communication Technology (PaCT) Lab at Northumbria University in Newcastle upon Tyne. Her research interests include e-learning, virtual work, employee security behaviors, and technology at work. Alecia M. Santuzzi is an Associate Professor in the Social-Industrial/Organizational Area of the Department of Psychology at Northern Illinois University in the United States. Her research expertise includes social perceptions in face-to-face and technology-mediated contexts and the role of demographic differences in those contexts. She also specializes in quantitative methods for psychology and management research. She assisted with conceptualization and writing the manuscript for this project.New Technology, Work and Employment 30:1