by trial and error

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ThesaurusAntonymsRelated WordsSynonymsLegend: trial and error - in an empirical manner; "this can be empirically tested"
References in periodicals archive ?
Ultimately, process engineers were able to reduce lead time and avoid further casting process design by trial and error.
Profile dies, however, are still mainly designed by trial and error using methods that have changed little over the past 40 years.