The Art of Creating Accurate Estimates(http://alistapart.com/column/creating-accurate-estimates)

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The author suggests that project estimations are frequently biased by optimism and pessimism.

He argues that optimism on estimates usually appears when a lack of experience leads us to ignore unknowns and underestimate tasks. On the contrary, previous negative experiences drive us to overestimate schedules.

1. From the above article, in your opinion, what is worse: over or underestimating?

2. Is there a way to combat the tendency to do these things based on past negative experiences or our need to be optimistic about the outcome?

3. In the article, the author proposed approaches to mitigate estimations inaccuracies, which one you consider the most effective? Explain why.

4. Ineffective? Explain why.