This is a confusing subject to discuss. Clients may know that they need a quantitative analysis, but do not know the exact technical jargon needed to specify their requirements. The most common problem results in a request for a "statistical analysis" when the development of a mathematical model would be a better fit to the client's needs. The confusion is heightened by the fact that some modeling techniques are considered "statistical methods" and are described in statistics books (e.g. multiple regression). Other modeling techniques are described in econometrics books or books on differential equations.