Trial and Error

Acording to F.M.Alexander "trial and error" is a form of end-gaining.
"His habit is to work directly for his ends on the "trial-and-error" plan, without giving due consideration to the means whereby those ends should be gained" (F.M.Alexander, The Use of the Self, page 33)
Now the question I would like to consider is, what constitutes a "trial-and-error plan"?
While rereading "The use of the Self" , I asked my self in what way Alexander's experiences described in the first chapter of that book differ from a "trial-and-error plan"?
We may notice that Alexander after each failed attempt, didn't "just" made it differently. No.
He learnt from each failure, he tried to find out what caused him to fail, and devised improved procedures to correct the mistakes he did.