にとってTo, For, Concerning

に取って (usually written in kana as にとって) expresses viewpoint or concern, e.g. 私にとって大切な人だ ('She's an important person to me'). において・における is a formal equivalent of で, conveying setting, context, or means, e.g. 歴史において重要な出来事だ ('It's an important event in history'). Unlike にとって, the latter can directly modify nouns in the における form, e.g. 教育における問題 ('Problems in education').

に取って (usually written in kana as にとって) shows viewpoint or relevance, often translated as 'to/for (A)' or 'as far as (A) is concerned', e.g. 子供にとって有害だ ('It's harmful to children'). にかけては highlights someone's strength or skill, e.g. 歌にかけては彼が一番うまい ('When it comes to singing, he's the best').

に取って (usually written in kana as にとって) indicates a perspective or viewpoint, e.g. 私にとって大切なことだ ('It's something important to me'). には can be used this way too, e.g. 私には分からない ('It's not understandable to me'), but also has broader uses like indicating purpose, target, or scope, e.g. 成功には努力が必要だ ('To succeed, effort is necessary').

に取って (often written in kana as にとって) and にしては both involve perspective, but にとって expresses personal relevance, e.g. 子供にとっては大問題だ ('It's a big issue for a child'), while にしては shows that a certain quality or characteristic defies expectations, e.g. 子供にしてはおとなしい ('He's quiet for a child').

These two phrases appear similar but are used quite differently. について means 'about (A)' or 'concerning (A)' and indicates the topic of a speech, discussion, etc., e.g. ゲームについて話す ('Speak about games'), while に取って (often written in hiragana as にとって) means 'to/for (A)' or 'as far as (A) is concerned' and is typically used to express perspective or point of view, e.g. 私にとって大切な人 ('An important person to me').

にしてみれば and にとって are similar in that both express that something is true from the perspective of a certain person or group. にしてみれば is more hypothetical, e.g. 初心者にしてみればなかなか難しい implies that one might expect something to be simple, but it's difficult from the perspective of a beginner. にとって is a more neutral 'to’ or 'from the perspective of', e.g. 私にとって宝物だ ('To me, it's a prized possession.').

に取って (usually written in kana as にとって) indicates a perspective or viewpoint, e.g. 社会にとって必要な制度だ ('It's a necessary system for society'). にしたら also means 'for (A)', but often implies a more subjective or emotional stance, e.g. 親にしたら心配だろう ('For a parent, it must be worrying').

に取って (usually written in kana as にとって) marks relevance or effect from a certain standpoint, e.g. 学生にとって分かりにくい説明だ ('It's a hard-to-understand explanation for students'). としては expresses viewpoint based on role or identity, e.g. 留学生としては反対だ ('As an exchange student, I disagree').

ばあいは (often written in kanji as 場合は) and に取って (often written in kana as にとって) can overlap in some cases, but not all. For example, 私の場合は and 私にとって can both mean 'as far as I'm concerned' or 'in my case'. However, since にとって simply means 'concerning', it can't replace ばあいは for the meaning of 'in the event that', e.g. 行く場合は気をつけたほうがいい ('In the event that you go, you should be careful.').