  The FAC, GRASP2K, and MCDFGME codes are compared in three case study of
radiative transitions occurring in tungsten ions: (i) Ni1 and Ni2 lines in
Ni-like tungsten, (ii) $3p_{3/2}{-}3p_{1/2}$ fine splitting in Cl-like
tungsten, and (iii) $K\alpha_{1}$ and $K\alpha_{2}$ lines in W VIII. Various
approaches to including the Breit interaction term and QED corrections in
atomic calculations are examined. Electron correlation effects are also
investigated and compared to the Breit and QED contributions. The data
presented here may be used to estimate theoretical uncertainties relevant to
interpretation of high-resolution spectroscopic data.
