Top-down estimates (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer. Any boxes left with a question mark will be automatically graded as incorrect.) ? are used in the project conceptual phase ? depend on surrogate measures such as weight or square feet or ratios ? do not consider individual activity issues and problems are good for rough estimates can help select and prioritize projects ? are made by people familiar with the task ? help to gain buy-in on the validity of the estimate ? should be preferred if estimating cost is reasonable Bottom up estimates (You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer. Any boxes left with a question mark will be automatically graded as incorrect.) ? are made by people familiar with the task ? help to gain buy-in on the validity of the estimate ? improve the accuracy of the estimate should be preferred if estimating cost is reasonable are used in the project conceptual phase ? depend on surrogate measures such as weight or square feet or ratios ? do not consider individual activity issues and problems