precision and accuracy.
   *
   A bad hypothesis can lead to low accuracy but high precision.
   *
   It looks great, but it's wrong.
   *
   But low precision and high accuracy (trial and error) gets you
   more-or-less where you need to be very quickly and you can
   always increase the precision over time until HOPEFULLY you get
   to high accuracy high precision.[1]Accuracy-vs-precision1

References

   Visible links
   1. http://icopiedyou.com/wp-content/uploads/2015/11/Accuracy-vs-precision1.jpg