Which method improves the accuracy of estimation by breaking work into smaller components?

Bottom-up estimation enhances the accuracy of estimation by dividing larger tasks or projects into smaller, more manageable components. This method allows for a detailed analysis of each individual work segment, leading to more precise estimation of time, resources, and costs required. By examining each smaller piece, stakeholders can identify potential challenges and resource needs that may not be evident when viewing the project as a whole. This granularity helps to mitigate the risk of underestimating or overlooking significant aspects of the work.

In contrast, methods such as top-down estimation involve a broader, more simplified perspective that may overlook essential details, thus leading to less accurate estimates. Historical estimation relies on previous project data, which may not accurately reflect current circumstances or specific project nuances. Expert judgment seeks input from experienced individuals, but subjective opinions can vary, which may lead to inconsistencies. In contrast, bottom-up estimation's systematic approach to detail improves the overall reliability of estimates, making it the preferred choice for enhancing estimation accuracy.