Tiered structure of the standard occupation classification 2000 for select occupations (Managers and senior officials). Diagram illustrates the different occupational groupings and levels that form the basis of the multilevel-models used to estimate synthetic wages. Numbers in brackets correspond to the occupation code. Diagram represents three of the eleven minor groupings within the managers and senior officials’ major grouping only due to space constraints. Details of the full classification can be found in ONS (2000).