[en] A summary of the relativistic quantum defect orbital (RQDO) method, as well as a few numerical examples of oscillator strengths, are presented. The radial functions in this formalism derive from solving a form of the decoupled second-order Dirac radial equation. With the method being totally analytical, it constitutes a simple and reliable procedure for predicting properties of interest in astrophysics and fusion plasma research, such as transition probabilities, while accounting for a large part of relativistic effects. Core polarization during electron transitions can also be explicitly accounted for in an analytic form