Well it's a bit more complicated than this. We have demo every two weeks and every two weeks they basically show to the stakeholders what they have done. Their efficiency is measured every two weeks and there is check for deviation. They had planned 2 tasks that they had to fail because of this issue so now their efficiency is on the low side.

While they tend to be whiny, I also blame the process.l It makes them thinking about ways to defend themselves and basically excuse their under performance.