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An issue report describes a bug or a feature request for a software system. When resolving an issue report, developers may discuss with other developers and/or the reporter to clarify and resolve the reported issue. During this process, questions can be raised by developers in issue reports. Having unnecessary questions raised may impair the efficiency to resolve the reported issues, since developers may have to wait a considerable amount of time before receiving the answers to their questions. In this paper, we perform an empirical study on the questions raised in the issue resolution process to understand the further delay caused by these questions. Our goal is to gain insights on the factors that may trigger questions in issue reports. We build prediction models to capture such issue reports when they are submitted. Our results indicate that it is feasible to give developers an early warning as to whether …