"advantages in groupthink" - Toefl

The article states that there are several advantages in groupthink, and gives some pieces of information about it. However, the lecturer explains that although there are many advantages in groupthink, there are a few disadvantages in it, and refutes the author's points about it. First, the reading claims that a group is capable of pool its intellectual resources for arrive at a better decision. The lecturer rebuts this point by saying that many things may be ignored when people make a decision through a group. Second, the article asserts that people don't be worry about a big responsibility for making a decision also their motivations would be encouraged. On the other hand, the lecturer says that individuals might think that they are not smart enough to decision making alone. Third, the reading says that people would be benefited by learning new negotiation, management skill and many new things. The lecturer opposes this point by illustrating that the group ignores anything that doesn't fit their vision.

Dear Mostafa,
drawing out its intellectual resources for arriving at a better decision.
will not be worry...for making a decision, also their motivations...to making decision alone
Third, the reading says that people would be benefited by learning new negotiations , managements skills and many new things

I suppose that your essay was not written long enough and lacked a lot information. Also, some words were not used properly :)