A phrase meaning 'when it comes to' or 'as for' a particular area/expertise; often emphasizes superior ability or specialization in that area.
数学にかけては彼がクラスで一番だ。
When it comes to math, he's the best in the class.
料理にかけては母の右に出る者はいない。
When it comes to cooking, no one can beat my mother.
安全管理にかけてはこの会社が業界トップだ。
This company is top in the industry when it comes to safety management.