How can I tell if my consultant is solving the right problem?
Write one sentence.
'If this engagement succeeds completely, X will be different in the business.'
If you cannot fill in X concretely, the engagement is not solving a problem you can verify.
If you cannot name what will be different, the engagement cannot prove it worked.
What concrete looks like
X is not 'we will have better processes.' X is 'our average time to close a sales decision will drop from 14 days to 5.' Specific. Measurable. Dated. If your X is vague, the engagement was scoped vague.