二战时期，美国社会工作者柯立尔和社会心理学家勒温通过对社会科学研究的反思，提出了( )的研究方法。

A．个案研究

B．团体研究

C．动力研究

D．行动研究

E．目标研究

You have created the project charter but could not get it approved. Your manager and his boss asked that the project begin immediately. Which of the following is the BEST thing to do

A．Set up an integrated change control proces

B．Push to get the charter signe

C．Perform an impact analysi

D．Start work on only the critical path task