Software Development-People mobility

Software development is not a simple thing. If a programmer is like a cabbage, mark a price, put it on the market and sell it,
Well, software, not, a bunch of cabbage piled together on the OK.

When people stay in one place for a long time, they may flow. After all, the world is so big.
However, once the software system has been developed, it should be running on line.
So the flow of people, should never be like a cabbage, one by one put. They overlap each other, and such overlapping parts should not be less than half a year. This software system is controllable.
Otherwise, the stitching will be fragile.

At the very least, the overlap should be maintained when people are moving.

In this picture, these people are pitiful, because they have no successor.

Succession is very important for the stability of software systems. Any job should guarantee that at least 2 people can operate the business.
This is human nature, otherwise, this person is doomed, he may be on the weekends, or any time, once the system problems, he must, immediately to the computer to deal with. This way, he will stay for a long time. So where do you expect the system to be stabilized?

Software Development-People mobility