The words “progress” and “process” are very similar, but the end intention of both is what sets them apart. Usually, “in process” refers to completing something, whereas “in progress” can refer to simply moving forwards but not necessarily reaching the end (at least not for a while).

Work in progress describes the costs of unfinished goods that remain in the manufacturing process while work in process refers to materials that are turned into goods within a short period. The terms work in progress and work in process are used interchangeably to refer to products midway through the manufacturing or assembly process.