对 … 而言 (as far as … is concerned)

From where they stand

• to / towards / correct对duì + Person / Group + (typically preceded by 就……而言ér yán = "for / as far as … is concerned".
• to / towards / correct对duìstudent学生xué shēng(typically preceded by 就……而言ér yán = "for students."
• It's the formal, written twin of to / towards / correct对duì…来说lái shuō.

to / towards / correct对duì + X + (typically preceded by 就……而言ér yán，…

• (typically preceded by 就……而言ér yán sets the perspective in a formal register.

for对duìme我wǒas for而言ér yán，this这zhèvery很hěnimportant重要zhòng yào。

• to / towards / correct对duìI / me我wǒ(typically preceded by 就……而言ér yán，this这zhèvery很hěnimportant重要zhòng yào = "for me, this is important."

Recap

Read the full reference: HSK 5 grammar — Prepositions.