What is the noun of for approach?

There isn't a single perfect noun for "for approach." It depends on the context and what you want to emphasize. Here are some options with examples:

General:

* Method: "We need a new method for approaching this problem."

* Strategy: "Their strategy for approaching the market was very successful."

* Technique: "He used a unique technique for approaching his customers."

* Process: "The process for approaching the interview was quite detailed."

Specific to a particular field:

* Methodology: (In research or scientific contexts)

* Framework: (In business or project management contexts)

* Tactics: (In military or strategic contexts)

* Plan: (When outlining steps)

More informal:

* Way: "What's the best way to approach this?"

* Angle: "We need a different angle for approaching this."

* Tack: "I think we should take a different tack for approaching this."

Ultimately, the best noun will depend on the specific situation. Consider what you want to convey and choose the most appropriate word.