Difference between stress and emphasis; informed and knowledgeable

[Millie]

Following is a cloze

In the majority of companies, more resources are allocated to management training than to other areas. Employers regard their better qualified staff as more important to the business, so they pay them accordingly and invest more in them in terms of training. This is justified by the fact that organisations are dependent on properly (1) managers making the right decisions. But this (2) may mean that companies are let other parts of the workforce down.

The two options for (1): knowledgeable & informed answer-informed
for (2): stress & emphasis answer - emphasis

please. tell me why the latter is right and corresponding differece between these words. Thank you very much!

[Mister Micawber]

It is a matter of collocation. 'Properly informed' and 'emphasis (upon something)'. 'Stress', if used, is open to ambiguity, since the word is used so frequently for 'emotional pressure' in this sort of context.
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Native English teacher at Mister Micawber's

[Millie]

Mister, thank you very much! I am clear now with the difference between stress and emphasis in the context of that cloze. But still not sure about the difference you pointed out about informed and knowledgeable for that blank. Do you mean the word "properly" before that blank decides "informed" must be selected, and we never say "properly knowledgeable"? Then there would one more question: if there is no such " properly" there, will there be any difference between informed and knowledgeable?

[Mister Micawber]

'Properly knowledgeable' is not a native phrase here. In addition, because of the previous text, we choose 'informed' (with or without 'properly', since that is the usual business word, encompassing not just knowledge but also business acumen: 'having or prepared with information or knowledge'.
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Native English teacher at Mister Micawber's

[Millie]

Thank you very much Mister!
I guess I see you point now. "Knowledgeable" indicates the knowlege we learn from books, comparatively theoretical; while "informed" involves both the theoretical knowledge we learn through books or school education and the experience we accumulate through real practical work. Therefore, informed would be a better choice since the context talks about business world.

And I really like this forum for having coaches like you here!