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I am having some difficulties with a sentence a colleague of mine has within a paper they have recently written. It involves rules regarding Plural Possessives in conjunction with Prepositional Phrases.

Adlerian therapy is tailored to meet the needs of today’s practitioner techniques of integrative, eclectic, brief, time-limited, present future oriented and directive, which is inline with the participants' of the studies predictions.

Or

Adlerian therapy is tailored to meet the needs of today’s practitioner techniques of integrative, eclectic, brief, time-limited, present future oriented and directive, which is inline with the participants of the studies' predictions.

I initially assumed the apostrophe would follow participants, because "of the studies" was a prepositional phrase, and the sentence would be fine if the phrase was removed. However, when I rewrote the sentence assuming there was merely one study and tried to say it, the apostrophe seemed to fit following study, which made me question my initial reaction, and assume it should be studies' in the sentence, and not participants'. Can you please help clear this up?

Thank you so much,

Jason
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None. IMO:

Adlerian therapy is tailored to meet the needs of today’s practitioner techniques of integrative, eclectic, brief, time-limited, present future oriented and directive, which is in line with the predictions of the participants in the studies.

Avoid apostrophes in possessives in scientific publications. They carry a note of informality.
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As already mentioned, this should be reworded because it's not appropriate for the context.
Nevertheless, the apostrophe always occurs at the end of the whole phrase.

You wouldn't say

The Queen's of England son is Prince Charles,

would you? Emotion: smile

So it has to be

the participants of the studies' predictions.

In fact, take a look at this one:

The person who has the highest income's house is bigger than the others.

These are so awkward that they are rarely used if there are more than three words within the scope of the possessive.

CJ
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Comments  
Thanks for the advice. I have passed that information on; however, I am now curious as to what is in fact a more correct sentence grammatically. Thanks again for the help!
BTW:

in line with

!!!
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 CalifJim's reply was promoted to an answer.
Thanks again all!!