Reinertsen's 1985 article in Electronic Business, written while still at mckinsey, which coined the term "Fuzzy Front End" to describe the ambiguous, ill-defined earliest stage of product development — the period between the first glimmer of a product concept and the formal commitment to develop it. Note: this entry appears to describe the same article as blitzkrieg-product-development ("Blitzkrieg Product Development: Cut Development Time in Half," Electronic Business, January 15, 1985). Reinertsen's earliest known publication was his 1983 Electronic Business article quantifying the financial cost of development delays, which predates this one.
The term captured a real problem that practitioners recognized but lacked language for. The front end of development is "fuzzy" in two senses: the work is inherently uncertain and hard to define, and organizations typically give it little structured attention, leaving it to proceed informally. Reinertsen's argument was that this ambiguity is not a failure of management rigor but a structural feature of early-stage development that requires its own discipline — one suited to managing-variability rather than eliminating it.
The phrase became standard across product development, engineering management, and innovation management literature. It is now used widely in academic and practitioner contexts, making this article a terminological milestone well beyond its original argument. The concept appears throughout Reinertsen's later writing, including managing-the-design-factory and principles-of-product-development-flow, where managing the economics of early-stage exploration is treated as a first-order problem.
The article is historically significant as the start of Reinertsen's publishing career and as evidence that his core preoccupations — economic discipline in the face of development uncertainty — were present from the beginning. His subsequent work can be read as a decades-long elaboration of the insight that the fuzzy front end deserves rigorous economic and process treatment.