Within dozens of highly-rated responses regarding both UK and Schengen entry, I see the phrase "personal impact and articulation skills."
There is no further explanation of what these mean and, in many circumstances, appear to be important, or vital, to successful outcomes. Can these be defined, quantified, expanded, and exemplified?
For the most part, the queries originate from those who don't require an entry clearance, many from US and Australian citizens, although not exclusively.
Tymoteusz Paul suggested that, in requesting temporary admission:
More than any other factor, the outcome of an event with a British Immigration Officer is influenced by personal impact and articulation skills.
Joel Damien explained to the student whose visa was expiring and wished to leave and re-enter as a tourist
This is entirely up to the Immigration Officer who lands you (if he does in fact land you). For both cases you will need a convincing reason why you are showing up after your course of study has ended. You can expect to be asked this question during your landing interview and the outcome will depend upon the plausibility of your answer along with your personal impact and articulation skills.
And Gayot Fow's guidance to a non-EU citizen who works in Germany but still has a valid UK residence permit and ask if he may enter using it:
Depending upon your nationality and other soft factors (personal impact and articulation skills) you may be successful with that.
The author of many answers, whom I queried, recommended opening the discussion among all TSE users, toward broader understanding and content when such terminology is used.
Personal impact: what is it, how is it accomplished, what are the positive and negative traits?
Articulation skills: what does that mean, what are better or worse, what traits are preferable or more successful?