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This paper examines the relationship between project planning processes and project success. Four planning input factors (human, management, technical and organizational factors) are considered which is believed to affect the quality of planning.

The study is based on data obtained from different construction projects performed in Ethiopia and includes an analysis on statistical correlation between planning input factors and planning processes, and between planning processes and project success. The study used Confirmatory Factor Analysis (CFA) to identify the key determining factors of project planning on success. The finding suggest that planning processes are insensitive to human factor. Moreover, only three project planning processes (time, cost and risk) are positively associated with the project success.