Every service blueprint you have ever seen has three horizontal lines. The line of interaction. The line of visibility. The line of internal interaction. Customer above, frontstage in the middle, backstage below. We draw them like they have always existed. Like Moses brought them down from the mountain on a stone tablet labeled “Service Design Artifacts.”
He did not. A woman named Jane Kingman-Brundage did.
In 1989, five years after Lynn Shostack published the first service blueprint in Harvard Business Review, Kingman-Brundage looked at what Shostack had made and saw what was missing. Shostack’s blueprints were engineering documents. Flowcharts with execution times, standard deviations, and fail points marked with “F.” They were brilliant and they were unreadable to anyone who was not an operations researcher.
Kingman-Brundage added the lines.
She separated the customer’s experience from the employee’s performance from the support processes that made both possible. She took an engineering diagram and turned it into a story with three acts: what you see, what makes it work, and what holds the whole thing up. The line of visibility was her invention. The idea that some work should be seen and some should not. That the boundary between frontstage and backstage is a design decision, not an accident.
Before her, Shostack’s blueprints were flat. Everything at the same level. The customer handing over money occupied the same visual plane as the database updating the ledger. Kingman-Brundage said: no. These are different kinds of work. The customer’s experience is not the same thing as the system’s process. Draw a line between them. Make the difference visible.
She published this in academic journals that design practitioners do not read. Her name appears in citations but not in conversations. Ask anyone in service design who invented the blueprint and they will say Shostack. Ask who made it usable and they will not have an answer.
The irony is architectural. Kingman-Brundage drew the line of visibility, the line that separates the work people see from the work they do not. And then she disappeared behind her own line. The backstage of service design history. The support process that made the frontstage possible.
There is another invisible figure. In 1959, thirty years before Kingman-Brundage drew her lines, Erving Goffman published The Presentation of Self in Everyday Life. He was a sociologist, not a designer. He argued that all human interaction is performance. We have a frontstage where we present ourselves and a backstage where we prepare. The waiter is cheerful at the table and exhausted in the kitchen. The doctor is calm in the exam room and panicking in the hallway. The performance is real. The boundary is deliberate.
Goffman got his language from the theater. Frontstage. Backstage. Performance. Audience. But he did not get it from watching plays. He got it from spending a year working undercover as a staff member at a hotel in the Shetland Islands in 1949, observing how the hotel workers performed for guests in the dining room and dropped the performance in the kitchen. The foundational metaphor of service design comes from a sociologist washing dishes in Scotland.
And before Goffman, there was Walt Disney. In 1952, Disney built Disneyland with a system of underground tunnels called utilidors. Cast members in costume entered and exited through the tunnels so that a cowboy from Frontierland would never be seen walking through Tomorrowland. Disney called it “onstage” and “offstage” seven years before Goffman published his book. The line of visibility was operational before it was theoretical.
So the genealogy is: Disney drew the physical line in 1952 with tunnels. Goffman named the concept in 1959 with sociology. Shostack applied it to services in 1984 with flowcharts. Kingman-Brundage made it usable in 1989 with horizontal lines on paper.
Four people. Forty years. An idea that traveled from theme park tunnels to sociology to banking operations to the diagrams we draw today. And of the four, the one who made the biggest contribution to the artifact we actually use is the one nobody remembers.
There is one more thing. I went looking for Shostack herself, and found something unexpected. G. Lynn Shostack was an art major at Sarah Lawrence before she became a vice president at Citibank. An art major who invented the most systematic, engineering-minded tool in the service design toolkit. She later donated ten million dollars to Princeton University to fund the Shostack Studio, an interdisciplinary space for “unstructured exploration and tinkering.” The woman who created the most structured framework in the field spent her fortune funding the most unstructured creative space she could imagine.
The systematizer funding chaos. The engineer who started as an artist. The backstage of every service blueprint is a story about someone who crossed a line they drew themselves.