What words or phrases might be useful in this tricky convers

All managers sometimes have to have difficult conversations with people working under them. What is the best way to give negative feedback?
很多经理有时候在与下属交流时有困难，给予负面反馈的最好方法是什么呢？
Imagine you are unhappy with the behaviour of a member of your team. You have decided¹ to raise the issue with this person and tell him or her that you would like to see an improvement. What words or phrases might be useful in this tricky² conversation?
假设你对你一个下属的行为不满意，你决定与他谈谈并告知他或她你希望看到什么样的提高。在这个令人头痛的交谈中你会用到什么样的词或短语呢？
tricky conversations

Useful Phrases
I’m not going to get into a discussion about… Clearly…What you need to do… But bearing in mind… I expect you to… It’s important that you… I’m not happy with the effort that you’ve made I really want to see some improvement You’ve got to snap out of it I know it’s difficult…
Transcript³
Sean:  Okay, well, I’m not going to get into a discussion about who deserved to get the 
job. Clearly, the person who was appointed was the right person for the job. 
What you need to do is look at your work and what you’re doing and where 
that’s taking you in your career. But bearing in mind that you are still employed 
to do a job and I expect you to do that job with a certain attitude. You’re meeting 
members of the public quite regularly - it’s important that you aren’t unhappy, 
or at least that you don’t show it. This meeting is really just to let you know I’m 
not happy with the effort that you’ve made... 
Michelle:  Okay … 
Sean:  … and I really want to see some improvement. I know it’s difficult. I know 
that it’s depressing not to get a job, but you’ve got to snap out of it（从。。。中迅速恢复过来）, you’ve got to 
get on with the job that you’re doing now.   (本文由在线英语听力室整理编辑)

1 decided   

adj.决定了的，坚决的；明显的，明确的

参考例句：

• This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
• There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。

2 tricky   

adj.狡猾的，奸诈的；(工作等)棘手的，微妙的

参考例句：

• I'm in a rather tricky position.Can you help me out?我的处境很棘手，你能帮我吗？
• He avoided this tricky question and talked in generalities.他回避了这个非常微妙的问题，只做了个笼统的表述。

3 transcript   

n.抄本，誊本，副本，肄业证书

参考例句：

• A transcript of the tapes was presented as evidence in court.一份录音带的文字本作为证据被呈交法庭。
• They wouldn't let me have a transcript of the interview.他们拒绝给我一份采访的文字整理稿。