8:2 law

Well, I have "almost" completed my new system. I feel about 80 percent of all the job was finished. But the rest of them, 20 percent is the problem. Different from making a building, programing of software is invisible work. I don't know how many percentage I have done before the completion. I'm now debugging my software and when I find a small bug, it sometimes requires a tough work of me. But the more bugs I can eliminate, the firmer and the more stable my system would be. Do you know the "8:2 law"? It means that when you have done 80 percent, you really have done only 20 percent. This law often suits computer systems. If it is true, am I just on the 20 percent yet?

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[Corrector]

Well, I have "almost" completed my new system. I feel about 80 percent of all the job is finished. But the rest of it, 20 percent, is the problem. Different from making a building, programing software is invisible work. I don't know how much I have done before it's completion. I'm now debugging my software and when I find a small bug, it sometimes requires a lot of hard work. But the more bugs I can eliminate, the firmer and the more stable my system would be. Do you know the "8:2 law"? It means that when you have done 80 percent, you really have done only 20 percent. This law often suits computer systems. If it is true, am I only on the 20 percent?