Professional and Career Topics

Hi everyone, I'm looking into how we pass down institutional and field knowledge from senior/retired engineers to the younger generation. Codebooks and textbooks are great, but they don't capture the actual 'lessons learned' on the job site or during a failure. To the seasoned PEs here: what is a rule of thumb or technical nuance in your discipline that you only learned through years of trial and error? I'd love to gather these insights.