In the construction industry, labor productivity is a key variable in the profitability of arnconstruction project. The most challenging issue for planning a construction project isrnpredicting the construction labor productivity (CLP) because it is affected with many factorsrnthat are objective and subjective ranging from internal to external. Based on review of thernliteratures, several research on CLP have been done in the past; however, a deeperrnunderstanding is still needed to control the construction labor productivity becausernparameters (factors and practices) influencing construction labor productivity are multifacetedrnand project dependent. In an attempt to predict CLP in construction projects, thisrnresearch aims to identify, classify and quantify parameters (factors and practices) influencingrnthe CLP of concrete placement, Rebar and formwork using a case study at the construction ofrnthe Meles Zenawi leadership academy situated at Goro by developing a multiple regressionrnmodel .In this paper, the effective factors that affect the CLP were taken from a largernliterature review and 20 factors were classified into Management, Labor/human,rntechnological and external termed based on the findings . In total, 222 data points have beenrncollected for a period of two months on both daily and weekly basis. Multiple regressionrnmodels have been developed for each activity. The slab formwork, column formwork, liftrnformwork and rebaring presented significant models with a coefficient of determination ofrn77.6%, 47.0%, 82.6% and 82.7%, respectively. In slab formwork activity, the study resultsrnindicated that increased crew size and complexity of the task decrease the CLP. In columnrnformwork, the increase in level of interruption and disruption, crew size, working conditionsrnand temperature will tend to lower the CLP, while the increase in the skills of labor and willrnincrease the CLP. In lift formwork, the model shows that the increase in crew size, shortagernof materials will decrease the CLP, whereas the increase in the crew experience and skillsrnlabor will increase it. For the rebaring activity the increase in skilled labor and clarity ofrntechnical specifications will considerably increase the CLP. In the study, the improvementrnstrategies are also discussed.