Conventions of System Design

Product types and cost accounts are always identified as successive rows in an input array. Periods of time are always expressed as column headings in any input array.

Inputs are never entered as percentages. Decimals must be used. For ease of reading, this documentation often refers to percentages when the input entry must actually be made as a decimal.

Definition of Terms

Variable - any item of data, an array 
Array - any item of data, a variable 
Scalar - a data array of no dimension, a single number 
Vector - a data array of one dimension, a series of numbers 
Matrix - a data array with two dimensions, rows and columns 
(actually a matrix can be of many dimensions, but 
its use in DEVPLAN© systems is always two-dimensional)