Historywooden bridges burns mcdonnell nd timeline of

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Burns & McDonnell (n.d.) Timeline of Commercial Aviation. Retrieved from: - commercial-aviation Computer Hope (2018) When was the first computer invented? Retrieved from: Computer Hope (2018) Microsoft Windows history. Retrieved from:
To estimate the budget and schedule for a new bridge or aircraft, engineers use actual data from previous bridges and aircraft. Word for Windows was an innovative piece of software with few or no precedents. Many bridges and aircraft are simply refinements of other existing artifacts. This reduces the proportion of the overall effort that is dedicated to design (which is the most difficult to estimate). Bridges and aircraft are often associated with severe financial penalties when late or over budget. Bridges and aircraft have safety requirements associated with them. This leads to a conservative approach to development including the use of mature technologies and well defined processes. Bridges and aircraft are sometimes delivered late too.

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