  Studying worked examples has been shown by extensive research to be an
effective method for learning to solve well-structured problems in physics and
mathematics. The effectiveness of learning with worked examples has been
demonstrated and documented in many research projects. In this work, we propose
a new four-step approach for teaching with worked examples that includes
writing explanations and finding and correcting errors. This teaching method
can even be implemented in courses in which homework performance constitutes
part of the grading system. This four-step approach is illustrated in the
context of Lagrangian mechanics, which is ideal for the application of worked
examples due to its universal approach to solve problems.
