Estimations are one of the most important parts of project planning and one of the most common tasks that developers do no matter which language they code in, what team they are on, or which company they work for. Estimating is hard, so hard we pretty much get it wrong a lot of the time. Not enough details - guesstimates Estimating without enough information is in my opinion of the leading causes of estimating poorly and causes project overruns.
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Code review is the process of having others review code that is written and accepting feedback and adapting the code to the feedback given. These days code review is seemingly at every IT department and widely ruled agreed upon as a best practice. It is often one of the largest sources of conflicts within a development team since giving and receiving criticism about work is often hard to do while remaining detached from the work itself.