Praktek rekayasa makarya pabinayan pantaraning "model matematika" miwah "model fisik"; prabéya fabrikasi model fisik prasida ngirangin kakawitin antuk makarya model matematika ngawigunayang paket perangkat lunak komputer, sekadi alat desain sané kawantu komputer.
Engineering practice makes a distinction between "mathematical models" and "physical models"; the cost of fabricating a physical model can be minimized by first creating a mathematical model using a computer software package, such as a computer aided design tool.