The Orac-dr pipeline is a suite of recipes and primitives for the automated processing of raw instrument data into scientifically-usable products. However for some observations there may be issues with the raw data files which prevent them from being able to be processed appropriately.
Wesley is a pre-processing pipeline (actually a special mode of Orac-dr) designed to apply corrections to problematic raw data. The complete data reduction process can therefore be envisioned as follows:
Pre-processing (when necessary).
Main data reduction.
Further analysis and combination of data (if desired).