.07 Software arrangements range from those that provide a license for a single software product to those that, in addition to the delivery of software or a software system, require significant production, modification, or cus- tomization of software. If an arrangement to deliver software or a software system, either alone or together with other products or services, requires significant production, modification, or customization of software, the entire arrangement should be accounted for in conformity with Accounting Research Bulletin (ARB) No. 45, Long-Term Construction-Type Contracts, using the relevant guidance herein, and in SOP 81-1, Accounting for Perform- ance of Construction-Type and Certain Production-Type Contracts [section 10,330].4