Duplication elimination

In engineering a computation project, one desires a single point of information entry. It's elegant to come up with coding structures that will facilitate this requirement, that is, a single place in the codes pertinent to the to-be-computed problems. However, while the programming language is an interface between human and machine. It's not generally friendly to the users. The ultimate way of choice is to have human readable/editable files and make programs to generate corresponding codes when needed.