The document discusses socio-economic groups that can be used to define a target audience, including Grade A (upper middle class professionals), Grade B (middle class intermediate managers), Grade C1 (lower middle class junior managers), Grade C2 (skilled working class), Grade D (working class manual workers), and Grade E (lowest level subsistence such as pensioners or students). It recommends selecting one of these socio-economic groups as the target audience for a media product.