The Monte Carlo method is the most common form of a mathematical model that is applied to predict long-term investment behavior for a client's retirement planning.[3] Its use helps to identify adequacy of client's investment to attain retirement readiness and to clarify strategic choices and actions. Yet, the investment domain is only a financial domain and therefore is incomplete. Depending on client context, the investment domain may have very little importance in relation to a client's other domains—e.g., a client who is predisposed to the use of real estate as a primary source of retirement funding.[citation needed]