The perfumer typically begins a project with a "brief" by their employer or a customer, typically a fashion house or other large corporation. This will contain the specifications for the desired perfume, and will describe in often poetic or abstract terms what it should smell like or what feelings it should evoke, along with a maximum price per litre of the perfume oil concentrate. This allowance, along with the intended application of the perfume, will determine what aromatic ingredients will be used in the composition.