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When you are talking to a 3rd person, fundamentally

> (1) それは、 **私達** の出来あげたものです。  
>  (2) それは、 **われわれ** の出来あげたものです。

mean:

> That is something that we all created together.

With regard to using them as **first person, plural, possessive pronouns** ,
this a nuanced choice. `I'm not asking about using them as subjects, objects,
topical nouns, etc. Just as possessive pronouns.`

  * My feeling is that #1 is about taking more direct credit for what was accomplished? It sounds rude? Like you considered yourself the lead in a small group of 4 or 5 people? 

  * Even if you were the lead, always express to outsiders that _a team of equals_ , among them yourself, accomplished something? That is choice #2?
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2016-07-15T02:59:46.893
36673
2016-07-17T02:09:33.570
2016-07-15T03:44:24.557
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nuances first-person-pronouns
Difference between "私達" and "われわれ" when used as possessive pronouns?
I don't believe that there is any special difference in meaning imparted by
adding の to われわれ or わたしたち・わたくしたち.

Adding の only turns these words into a possessive pronouns.

The choice between these expressions will always involve how you feel about
who you are addressing and people you include as "we", regardless of whether
what follows describes something you have done together or not.
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2016-07-15T03:21:17.963
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2016-07-15T03:21:17.963
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There are no such differences in terms of nuances that you point out. Both are
not rude and can be used for 4,5 people. 私たち and われわれ are always
interchangeable without making the sentence rude or improper.

Instead, it changes an impression a bit. われわれ sounds slightly more academic or
political while 私たち sounds slightly softer. Or I can say われわれ, in any
grammatical situations, is more used by male speakers. But it's not strange at
all if women use われわれ.
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2016-07-15T05:28:46.287
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* There is not such verb as 出来上げる, although 出来上がる (intransitive) and 作り上げる (transitive) exist.
  * No one can possess a verb. That の after 我々/私たち is a _subject_ marker, which can replace が only in relative clauses. See: [How does the の work in 「日本人の知らない日本語」?](https://japanese.stackexchange.com/q/12825/5010)
  * 我々 and 私たち are always first person and plural pronouns, of course. And I don't know why you think they behave differently only when used as the possessive pronouns.
  * Simply, 我々 is more formal and stiffer than 私たち. The number of people in the group doesn't matter. The level of confidence doesn't matter. Whether you were a lead or not doesn't matter, either. You can use 我々 when you do a presentation in a business setting, make a serious speech, take a job interview, etc. But recently more and more people tend to use 私たち in such a situation, too, because 私たち sounds milder. Politicians 100 years ago might have been using 我々 all the time, but we often hear politicians say 私たち today. Using 私たち won't be rude in almost any situation. Using 我々 in an inappropriate situation (eg. among close friends and referring to "we") is not rude, either, but it may sound a bit unfriendly, depending on the context.
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2016-07-15T05:48:49.950
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2016-07-15T06:26:40.890
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Essentially, both mean "We". In my experience 我々 has the nuance of a "we"
within a defined group: we (our class, our company, our country), where 私達 has
no nuance. A very common use case is 我々日本人
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2016-07-17T02:09:33.570
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