their contractors’ fields so as to be prepared to understand even the ordinary risks involved in the work and assure that the precautions necessary to manage those risks are taken. Id. at 698. This law is of long standing in Iowa. For example, in Robinson v. Poured Walls of Iowa, Inc., 553 N.W.2d 873, 874 (1996), a worker was injured while excavating a clogged sewer pipe that had been installed by the defendant. The defendant had hired the plaintiffs firm to do the repair work when the sewer line malfunctioned. Id. We affirmed the grant of the defendant’s motion for summary judgment based on absence of duty, reasoning that the plaintiffs employer, not the defendant contractor, had control over the work. Id. at 875-76; see also Hoffnagle v. McDonald’s Corp., 522 N.W.2d 808, 813 (1994) (<HOLDING>); Downs v. A & H Constr., Ltd., 481 N.W.2d 520,
holding that the court must consider the extent of control exercised by the defendant over the third partys means of infringement holding that the union owes its representatives a duty to enforce the terms of the negotiated collective bargaining agreement holding that a district courts denial of a claim of qualified immunity is an appealable final decision within the meaning of 28 usc  1291 to the extent that it turns on an issue of law holding that a landlord has a duty of reasonable care over common areas or other areas over which the landlord has retained control holding that wjhether a franchisor owes a duty of care to its franchisees employee  turns on the extent of the franchisors retained control over the property and the daily operation of the restaurant