Production involves transforming inputs into outputs through factors of production like land, labor, capital and entrepreneurship. A production function mathematically models the relationship between inputs and maximum possible output, assuming constant technology. In the short run, some inputs are fixed while in the long run all inputs are variable. Total product is the total output from a variable input. Average product is total product divided by the input quantity. Marginal product is the change in total product from a small change in the variable input. A table is provided showing how total, average and marginal product change at different labor input levels.