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> このうち、これまでに５回、パラリンピックに出場した競泳の成田真由美選手は、左手が不自由で、ふだんからエスカレーターの右側につかまって乗っていることを
> **紹介したうえで**
> 「意識を変えることに費用はかかりません。障害のある人の立場にたって考えてほしい」と呼びかけました。([article](https://www3.nhk.or.jp/news/html/20180623/k10011492721000.html?utm_int=news-
> life_contents_list-items_006))

According to the answers of this
[question](https://japanese.stackexchange.com/questions/15190/meaning-
of-%E9%81%8E%E5%8E%BB%E5%BD%A2%E3%81%AE%E5%8B%95%E8%A9%9E-%EF%BC%8B-%E4%B8%8A%E3%81%86%E3%81%88%E3%81%A7),
"ta-form + 上で" means that the second action is performed based on the result
of the first action.

If the writer had used てから, it would have meant : doing the 紹介 and then the
呼びかけ (without telling anything about the relation between them except that 紹介
is made before the 呼びかけ)

But the author uses 紹介した上で, so it means(according to the stack exchange post I
linked before) that the result of 紹介する is used to do the second action (呼びかける)

I don't understand what is the "result" of 紹介 and how this result is used in
the 呼びかける.

According to me, the result of a presentation is the reaction of the public,
so 呼びかける should be made according to the reaction of the public but it sounds
odd because since the 呼びかけ tries to raise the awareness and convince the
public,it would mean that the reaction of the public was negative.

I don't think it's the correct interpretation so my very question is:

**" ta-form + 上で" means that the second action is performed based on the
result of the first action. In the context of this article, what is the
"result" of 紹介 and how is this result used in the 呼びかける ?**
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2018-06-25T16:59:45.747
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question
grammar
What is the meaning of ta-form + 上で in this context?
As you have pointed out, understanding this ta-form + 上で expression is
dependent on understanding what "result" is being referred to.  
The result of 左手が不自由で、ふだんからエスカレーターの右側につかまって乗っていることを紹介する is that people are now
**aware of the reason** she and others in similar situations have to be on one
side of the escalator. So now that that reason has been announced publicly,
she is asking that people be more aware of such situations, be considerate,
etc.
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2018-06-26T04:39:23.837
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"ta-form + 上で" means basically "after doing". It has a nuance that a following
sentence is on the premise for a sentence before 上で. That is the speaker
emphasizes that a sentence before 上で is before a following sentence.

For example, 私は英語を勉強した上でアメリカに行きたい is almost the same as 私は英語を勉強した後でアメリカに行きたい
or 私は英語を勉強してからアメリカに行きたい. However when you use 上で, it has the nuance like going
to the U.S is on the premise for learning English.

As for your sentence, it means "After she introduced her trouble when she take
an escalator, she appealed that she want people to think about things from
handicapped people's viewpoints". It was emphasized that introducing her
trouble was before her appeal and her appeal was on the premise for it.
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answer