This document discusses joint cost and byproducts accounting. It defines key terms like joint costs, splitoff point, separable costs, main product, joint products, and byproducts. It provides examples of joint cost situations and gives an overview of the joint cost process. It discusses reasons for allocating joint costs and how to distinguish joint products from byproducts. The document then explains several methods for allocating joint costs, including market-based, physical measure, weighted average, and net realizable value methods. It provides an illustration comparing the physical measure and sales value at splitoff point methods. Finally, it covers accounting for byproducts, comparing production and sales methods, and providing an illustration for The Westlake Corporation.