心中有数 (xīn zhōng yǒu shù) — to have a clear picture of the situation; to know what's what (so you can act confidently)

Definition

Examples

• 这次考试我心中有数，肯定能通过。
  Zhè cì kǎo shì wǒ xīn zhōng yǒu shù, kěn dìng néng tōng guò.
  I have a clear sense of this exam — I'm sure I can pass.
• 谈判之前，你已经心中有数了吧？
  Tán pàn zhī qián, nǐ yǐ jīng xīn zhōng yǒu shù le ba?
  Before the negotiation, you've already got a good understanding, right?
• 他对项目的风险心中有数，所以没有匆忙签字。
  Tā duì xiàng mù de fēng xiǎn xīn zhōng yǒu shù, suǒ yǐ méi yǒu cōng máng qiān zì.
  He had a clear picture of the project's risks, so he didn't sign hastily.