1. A method for creating a supplier rating matrix for rating services of a supplier, the method comprising: defining a plurality of job attributes each including a plurality of sub-attributes, each sub-attribute representing a range of job attribute values; defining a job attribute vector, the job attribute vector including a plurality of dimensions each corresponding to a sub-attribute; defining a plurality of performance metrics; defining a performance vector, the performance vector including a plurality of dimensions each corresponding to a performance metric; defining a first initial value for the job attribute vector; defining a second initial value for the performance vector; and generating a supplier-rating matrix for the supplier by mathematically combining the job attribute vector and the performance vector.