It's always going to be very much a matter of insight, judgment, guesswork, and so forth.
Based on my experience with my own sources, guesswork about who is behind a story is often wrong.
It's also almost 100% guesswork, at least for the period before 1976, and certainly for the period before 1925.
My longitude was little more than guesswork; my latitude not very certain; and my compass was out.
The further in they went the greater the guesswork of the going.
There's no guesswork there, but the most rigid scientific tests.
This, he recognized, was guesswork, but still it might be the truth.
The flying machine of those days was largely a matter of guesswork.
For our clearest knowledge is but guesswork when it is not based on numbers.
I may be right or wrong, that's guesswork at the best, and let me get to my facts again.