Writing in English is considered an important skill for ESL learners, and qualified teachers are needed in order to provide the students with written corrective feedback (WCF). Much previous research on WCF has looked at its overall effectiveness, with less attention paid to the teachers' perceptions of WCF methods and expected outcomes when they implement feedback. The aim of this mixed methods study was to investigate Libyan university English teachers' perceptions of their knowledge, experience, and training connected to their beliefs regarding WCF. The current investigation was informed by the combination of two constructs proposed by Borg (2003) and Ellis (2010), as well as the current literature and the researcher's personal learning and teaching experience. A survey collected quantitative data from 45 teachers at Tripoli University, and qualitative data was gathered from semi-structured interviews of four teachers. The descriptive findings of the study showed that most participants have clear perceptions of the process of providing writing corrections. However, there were also inconsistencies in their focus on the specific WCF types. Findings from survey responses also revealed the participating teachers have little background in training on WCF types, and they are largely influenced by traditional ways of correction and provide direct feedback. In-depth information from the interview responses further indicated that this absence of knowledge was due to not having training to help them know about or apply various types of corrections. Results suggest that teachers can provide targeted feedback based on students' language goals and areas of weakness, maximizing the effectiveness of instruction. Moreover, administrators are recommended to allocate resources such as training, materials, and technology to support teachers in delivering effective WCF. Future studies can explore the long-term effects of WCF on students' writing proficiency, retention of feedback, and transferability across writing assignments. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]