Main Purpose Doctrine — The “main purpose doctrine” or “leading object rule”
is an exception to the suretyship provision based on the purpose or object of the
promisor. Where the object of the promisor is to obtain an economic benefit for
himself, the promise is not within the statute and is therefore enforceable
without a writing.
CASE 15-1
ROSEWOOD CARE CENTER, INC., v. CATERPILLAR, INC.
Supreme Court of Illinois, 2007
226 Ill.2d 559, 877 N.E.2d 1091, 315 Ill. Dec. 762
http://scholar.google.com/scholar_case?case=1422781429709921037&q=877+N.E.2d+1091&hl=en&as_sclt=2,22
Burke, J.
[On January 3, 2002, Caterpillar contacted HSM Management Services (HSM), the management
agent for Plaintiff, Rosewood Care Center, Inc. (Rosewood), a skilled nursing facility. Caterpillar
requested that Rosewood admit Betty Jo Cook, an employee of Caterpillar, on a “managed care
basis (fixed rate).” HSM advised Caterpillar that Rosewood would not admit Cook on those
terms. Shortly thereafter, on January 10, Dr. Norma Just, Caterpillar’s employee in charge of
medical care relating to workers’ compensation claims, contacted HSM. Just told HSM that Cook
had sustained a work-related injury and was receiving medical care at Caterpillar’s expense under
the workers’ compensation laws. Just requested that Cook be admitted to Rosewood for skilled
Caterpillar’s authorization for Cook’s care and treatment in accordance with the January 10
agreement, except that Sue now advised HSM that Cook was precertified for two weeks of care
instead of the original four weeks. On January 30, Cook was admitted to Rosewood. Upon her
admission, Cook signed a document entitled “Assignment of Insurance Benefits” as required by
law. In this document, Cook assigned any insurance benefits she might receive to Rosewood and
acknowledged her liability for any unpaid services. Caterpillar, through its health care
management company, continued to orally “authorize” care for Cook and did so on February 8,
February 25, March 11, March 21, April 8, April 18, May 16, and June 4. Cook remained at