People talked about the myth month:
The lack of a reasonable time schedule is the main cause of most projects lag, affecting him than all other factors are also large.
So what led to this reason?
1: the lack of effective research on estimation techniques. - optimistic that everything will work well
Estimation techniques: when the progress of the project estimate, or for some technical methods when the project estimate. Translated into estimation methods.
2: estimation techniques used implicitly assumes that humans month interchangeably, incorrectly schedule and workload confused with each other.
A person can be completed in October ≠ 10 a month to complete the development of a personal mission.
3: Due to a lack of confidence in their estimates, software managers usually do not have the patience to estimate these ongoing work.
4: the lack of progress tracking and oversight. In other engineering fields, proven tracking technology and conventional monitoring procedures in software engineering tasks are often meaningless thing.
5: When the offset aware of the progress of the increase in human knee-jerk reaction, it is like fire, like gasoline, will only make things worse
This may be based on the specific situation, some projects many simple tasks, may increase the developer can increase progress.
Programmers are optimists. The first assumption behind the accuracy of all system programming schedule is: everything will work well, each task takes only the time that it "should" take.
《The Mind of the Maker》--Dorothy Sayers
Creative activities are divided into three stages: conception, implementation and exchange
It appears books, or computer program, first as a concept or model appears in the author's mind,
It is independent of time and space. By some carriers to achieve their in real time and space. Then, when the reader or user to read books, use computers and running the program, he and implementation of mutual communication, which is the end of the creative process.
For the creators, only in the realization of the process, we can find the idea of incompleteness and inconsistency.