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A study was conducted to assess the extent of influence of uncertainty on the accomplishment of planned project objectives through examining planning outcomes and attempts to pinpoint the factors having the greatest influence on the outcome. Data were collected from a questionnaire mailed to 400 top US construction firms, to which 72 replied. The questionnaire proposed a model project with 4 fixed and 8 variable characteristics grouped under 3 main project dimensions -- project complexity, project uncertainty, and attitudes toward planning. The results showed that, when moving from average to complex or uncertain situations, planned project objectives were affected considerably. However, a majority of the respondents felt that simple or certain situations had no effect on planning outcomes. Factors regarded as most influential were percentage of completion of design and construction experience. Factors having a strong influence were labor supply, weather predictability, and attitudes toward planning.