Most senior hires that fail in the first six months do not fail on capability.
The CV was right. The technical work was real. The references checked out. They fail because the candidate's identity, who they are when nobody is watching, did not match the company they joined.
This happens for a specific reason. The executive search industry, and most internal talent teams, use one assessment vocabulary for two genuinely different things. Both get called soft skills. Both get loosely called culture fit. The conflation is the problem, and it is deeper than most people realise.
i. The two questions
Senior hiring asks two questions.
Most assessment processes ask the first one twice and barely ask the second one at all. The two questions are what can this person do and who is this person. They are different categories. They need different evidence. The interviewer should know which register they are in at any given moment.