Regardless of whether one works in configuration space or phase space, when equating the operator formalism and the path integral formulation, an ordering prescription is required to resolve the ambiguity in the correspondence between non-commutative operators and the commutative functions that appear in path integrands. For example, the operator 1 2 ( q ^ ^ p ^ ^ + p ^ ^ q ^ ^ ) can be translated back as either q p − − i ℏ ℏ 2 , q p + i ℏ ℏ 2 , or q p depending on whether one chooses the q ^ ^ p ^ ^ , p ^ ^ q ^ ^ , or Weyl ordering prescription; conversely, q p can be translated to either q ^ ^ p ^ ^ , p ^ ^ q ^ ^ , or 1 2 ( q ^ ^ p ^ ^ + p ^ ^ q ^ ^ ) for the same respective choice of ordering prescription.