“When a user uses the system, she or he will perform a behaviorally related sequence of transactions in a dialogue with the system. We call such a special sequence a use case.”

— Ivar Jacobson

Source: Object-Oriented Software Engineering: A Use Case Driven Approach (1992), p. 127; as cited in: Journal of Object-oriented Programming Vol 10, Nr 2-9. p. 32.

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Ivar Jacobson6

Swedish computer scientist 1939

Richard Boyatzis (1946) American business theorist

Source: Competent manager (1982), p. 33.

“A use case is a complete course of events in the system, seen from a user’s perspective.”

Ivar Jacobson (1939) Swedish computer scientist

Source: Object-Oriented Software Engineering: A Use Case Driven Approach (1992), p. 157.

“[The process of system design is]… consisting of the development of a sequence of mathematical models of systems, each one more detailed than the last.”

A. Wayne Wymore (1927–2011) American mathematician

A. Wayne Wymore (1970) Systems Engineering Methodology. Department of Systems Engineering, The University of Arizona, p. 14/2; As cited in: J.C. Heckman (1973) Locating traveler support facilities along the interstate system--a simulation using general systems theory. p. 43.

“Use cases, scenarios or scripts are roughly synonymous terms for important ways to focus our design activities. I prefer the term use case (although quickly saying it three times can leave your tongue tied) because it emphasizes usage. A use case is a textual description of a sequence of interactions between an actor (roughly corresponding to an external agent or class of users) and the system we are designing. Use cases were first described by Ivar Jacobson in his book “Object Oriented Software Engineering A Use Case Driven Approach.”
Use cases have been around in various forms for quite some time. Jacobson, however, made the keen observation that use cases can be treated as refineable, extensible and even reusable specifications of system requirements. We’ve had these same goals for object designs. We know that it is harder to actually accomplish them than it is to talk about them.”

Rebecca Wirfs-Brock (1953) American software engineer

About What is a Use Case?
Designing scenarios: Making the case for a use case framework (1993)

“My first colour sequence was in what was then called ‘Geva Colour’ for the dream sequence in Nagin.”

Vyjayanthimala (1936) Indian actress, politician & dancer

Why Vyjayanthimala has 'nothing to say' about today's heroines

“The purpose of a classiﬁcation scheme is to arrange information, in documents on shelves or on cards in indexes, in a sequence that will be helpful to the user.”

Douglas John Foskett (1918–2004)

Source: Classification and indexing in the social sciences (1963), p. 93; As cited in: Mei Hong (2006, p. 44)

“The Social System School: Closely related to the human behavior school and often confused or intertwined with it is one which might be labeled the social system school. This includes those researchers who look upon management as a social system, that is, a system of cultural interrelationships. Sometimes, as in the case of March and Simon, the system is limited to formal organizations, using the term "organization" as equivalent to enterprise, rather than the authority-activity concept used most often in management. In other cases, the approach is not to distinguish the formal organization, but rather to encompass any kind of system of human relationships.”

Harold Koontz (1909–1984)

Source: "The Management Theory Jungle," 1961, p. 179

“Biotech companies spread patented genetic sequences via the natural ecosystem—much like a computer virus. Then they use the legal system to claim ownership of any organism their patented genetic sequences invade. They are raiding communal seed banks, obtaining patents for naturally occurring apples, sugar beets, corn, and a host of other plants and animals. They have immorally seized control of the food system and stand poised to claim ownership of life itself unless we take action.”

Daniel Suarez book Freedom™

Source: Freedom™ (2010), Chapter 9: Seed Police

“However useful it is for pedagogical purposes, the biological metaphor of style as a sequence of life-stages was historically misleading, for it bestowed upon the flux of events the shapes and behavior of organisms.”

George Kubler (1912–1996) American art historian

Source: The Shape of Time, 1982, p. 8 as cited in: Pamela M. Lee, " " Ultramoderne": Or, How George Kubler Stole the Time in Sixties Art. http://xenopraxis.net/readings/lee_ultramoderne.pdf" Grey Room (2001): 55.

“Individual societies begin in harmonious adaptation to the environment and, like individuals, quickly get trapped into nonadaptive, artificial, repetitive sequences.
When the individual's behavior and consciousness get hooked to a routine sequence of external actions, he is a dead robot, and it is time for him to die and be reborn. Time to "drop out," "turn on," and "tune in."”

Timothy Leary (1920–1996) American psychologist

This period of robotization is called the Kali Yuga, the Age of Strife and Empire...
The Purpose of Life is Religious Discovery
Start your own Religion (1967)

“When a user uses the system, she or he will perform a behaviorally related sequence of transactions in a dialogue with the system. We call such a special sequence a use case.”

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