>>3
One guy just didn't have the will to program. He was stuck on a problem and didn't advance until someone asked "what are you working at?". Zero proactivity. After checking the logs from the proxy, we saw that he spent all day only on facebook and silly websites. He only 'worked' two weeks.
The other two guys were "too slow". They worked, they made questions, but tasks like doing a form in php (with the stored procedures, and all referent to that) took them too long.
Those guys were hired to help our only competent PHP programmer, and take more projects from our clients. Now, he is still alone, and is capable of taking whole projects by himself, and the two last guys were only slowing him. If fact, the guys were fired because he said they were not competent enough.