When we are introducing Scrum to a new environment, we often get into debates, sometimes heated, with people who question the validity, truth and/or value of a particular agile or Scrum principle. My general feeling is that any time spent having a philosophical argument with a client/Product Owner is time not spent adding value.
One of the main myths of traditional project management relates to measurement precision. Traditional project managers have numerous statistical tools in their arsenal. Such measures as earned value or cost performance indicators etc. are touted as providing a precise scientific measure of how we’re doing.