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The aim of this research was to investigate the causes of time overrun in telecommunication projects in Zambia. To achieve this goal a multi-mode descriptive study was adopted by using both qualitative and quantitative approaches. A detailed literature review was undertaken in which 34 factors that cause delay in telecommunication projects were identified and verified through interviews. These factors were then categorised into five generic elements using a fishbone diagram framework. A questionnaire containing 34 identified factors was distributed to the rest of the professionals involved in telecommunication projects including network operators, equipment vendors, contractors, telecommunication infrastructure support companies. The results gave a response rate of 78%. Findings showed that eight highest ranked factors were identified with the highest frequency of occurrence and impact on the schedule. Most of the interviewed experts pointed to poor planning as the main cause of project schedule overrun, which affects subsequent project phases. Based on the fishbone framework, it was also found that process-related factors were the major contributors to project delays. These results highlight the need to adopt the Project Talent Triangle to enhance project time performance for telecommunication projects that improves time management processes and is considered and the emerging trend.