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When you are writing code it is common to think "I may need XYZ" but I am not really going to need it, Agile advocates using the available time as best as possible and if you do not really need it then why waste time ? Agile also advocates refactoring...
Some software approaches run in cycles Gather requirements (sometimes) Write Code Test code (sometimes) Get the requirements wrong and the requirements change midway through writing the code and your writing more code or changing code and the time scale...
Martin Woodward has a great article on software estimation, why it is hard and what Agile brings to the table . The approach I have seen the most in the past is the grand old FITA analysis (Finger in The Air) estimate. Get it right and your on time, get...
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