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It seems to me that there are not three grammar points here, but rather one that should be named:

according to ‾ / depending on ‾

Thanks, added it! Should be #4

I agree with the above user - instead of having 4 separate grammar points, they really should be rolled into one, two at the most (according to/depending on, and maybe another for 'for each')

I'm embarrassed: I guess I completely missed the fact that he was suggesting a consolidation, not an addition. I've got to write something up that'll handle the merging so the other user sentences aren't lost, but I'll combine them today/tomorrow.

この文法ポイントは理解しにくい！ This grammar point is, in my Unicom grammar book, split into four points.  Here are the constructions:

1. Noun + によって・により
2. によって(は)
3. Noun 1 + による + Noun 2
4. Noun + によると・によれば (According to)

Ok, so let's try and organize it into each definition.

(ones on this page)

によって(は) - by, though the means of
によって,により - depending on, according to, based on, due to

(not on the page)
によると,によれば - according to (repeating information heard from elsewhere)
NによるN - ??

What's the last one, and do you agree with how I've divided them up? If so, I'll go ahead and make the changes

によって ・ により shows means, cause, method, or a passive agent (手段・原因・方法・受身文の)動作主).
によっては  means 「Some; for (some); certain 」(ある ‾の場合は)
Noun + による + Noun shows means and cause (手段・原因).

によっては example sentences:

明日は一日中雲が多く、ところによっては一時雨が降るでしょう。 (Unicom)
Tomorrow it's cloudy throughout the day, with intermittent rain showers in some areas.

でも、場所に よっては−−例えばアメリカの大都市… (alc.co.jp)
But in certain places, like in big cities in the United States,…

「それって、もうかるの？」「うん、人によってはね。」(alc.co.jp)
"Is it profitable?" "Yes, for some."

Thanks. I'm still going to split up the 'means/method' and the 'cause' parts of によって/により because I think the definitions are different enough to split apart.

I'll clean it up now, so if it's more than 10 or 15 minutes after this message has been posted, check it out and let me know if you see any issues.

Do you have an example for NによるN?

Here you go:

(1) 高速道路が整備されて、トラックによる輸送がさかんになった。
(2) 先週の事故は運転手の居眠り運転によるものだったことがわかった。
(3) 台風による農作物の被害が全国に広がっている。

Thanks!

I was wondering if someone could further explain the 3rd point or provide other examples? I tried looking it up in a grammar book I have and I asked my boyfriend, but I'm still a bit unclear.

I don't have any other on hand, but do you see the message that's 4 posts above yours? (by mireille). It's got a few in there!

There's a big mistake in the first point:
によって・により
As I can see from the examples sent by users, people are now convinced you can just replace に, in a passive sentence, with によって, nothing　could be more wrong.　My teacher has explained to me that によって can only be used if you are creating, building, discovering, writing something that was never done before or with verbs like 得る, 解明する, 発信する, 制定する, 拘束する and 運営する.

によって doesn't just mean "by" and can be used instead of で when it indicates what permitted a certain developmnt of a situation (quoting my teacher: 話し合いによって解決できる。 By discussing over it we came to a conclusion). I know it is difficult to explain.

Thanks for the comment! What do you think about the following two sentences?
彼は難病によって再起不能になった。
and
その少年は麻薬によって青春時代を失ってしまいました.

(both from a grammar dictionary)

It doesn't to me that either of those fit into the rule that your teacher gave? I am very interested in fixing any mistakes on the grammar pages, so I wanted to say thanks in advance for your interest in helping!