Final answer:
Individual skills, Planning horizon, and Familiarity with the task are 'people factors' influencing project estimate quality.
Explanation:
Individual skills, Planning horizon, and Familiarity with the task are key 'people factors' that can influence the quality of project estimates. Individual skills reflect the expertise and capabilities of team members involved in the estimation process. Planning horizon refers to the time frame over which the estimation is made, impacting the accuracy of the estimate. Familiarity with the task relates to how well team members understand the requirements and complexities of the project, affecting estimation precision.
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