Trygve Reenskaug

• Reenskaug, Trygve (2019). Personal programming and the object computer. Software and Systems Modeling (SoSyM). ISSN 1619-1366. doi: 10.1007/s10270-019-00768-3.
• Reenskaug, Trygve (2007). Programming with Roles and Classes: The BabyUML Approach. In Klein, Ari (Eds.), Computer Software Engineering Research. Nova Science Publishers. ISSN 1-60021-774-5. p. 45–88.
• Reenskaug, Trygve (2007). The Case for Readable Code. In Klein, Ari (Eds.), Computer Software Engineering Research. Nova Science Publishers. ISSN 1-60021-774-5.
• Reenskaug, Trygve (2006). The BabyUML discipline of programming where A Program = Data + Communication + Algorithms. Software and Systems Modeling (SoSyM). ISSN 1619-1366. 5(1). doi: 10.1007/s10270-006-0005-0.

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• Reenskaug, Trygve (2007). Roles and Classes in Object Oriented Programming.
• Reenskaug, Trygve (2007). Specify System State and Behavior explicitly through the DCA programming paradigm. Show summary

  n the Data-Collaboration-Algorithm (DCA) programming paradigm, the specification of system state is separated from the specification of system behavior. The Data part specifies how the system state is distributed among the attributes of the system objects. The data specification is in some form of schema language. The Algorithm part specifies how system behavior is distributed among the methods of the system objects. An Algorithm is expressed in a kind of dataless programming language where objects are represented by the roles they play in an interaction. Finally, in the Collaboration part, roles are dynamically bound to run time objects and thus to classes. This binding is through expressions that select the actual objects to play the roles at any given point in time. The main advantage of the DCA paradigm is the increased leverage that results from its explicit specification of system state and behavior .

• Reenskaug, Trygve (2007). Things your motherdidn't tell you about architecture and GUIs. Show summary

  There are two roads through design. Both clarify user environment and needs. Use Cases capture examples of required operations, the imperative aspects of the requirements. Data Modeling captures the user's mental model, the declarative aspects. New operations can be added as new requirements are discovered; the Data Model acts as a constraint on what will be easy to do, what will be hard to do, and what will be almost impossible. This talk looks at software design through the eyes of Model-View-Controller. One implication of this perspective is that the Data Model and architecture are as important to usability as are GUI design and Use Cases. The approaches complement each other well and are captured in the MVC and DCAC architectures.

• Reenskaug, Trygve (2007). Roles and Classes in Object Oriented Programming. Show summary

  The value of a system is greater than the sum of its parts; the system organization giving the added value. In this article we show how a system description can be split into state and behaviour parts. State is described in terms of classes and associations; behaviour is described in terms of roles and connectors. This article focuses on the behaviour part and its most important contribution is the use of selection to bind roles to objects and thus to classes. This leads to a balanced paradigm for describing the state and behaviour of object systems.

• Reenskaug, Trygve (2007). Object Oriented Role Analysis Method(OOram.)Demo and discussion.
• Reenskaug, Trygve (2007). Things your motherdidn't tell you about architecture and GUIs.
• Reenskaug, Trygve (2006). MVC and DCA:Two complimentarysystem architectures.
• Reenskaug, Trygve (2006). Communication. The Key to the Future.
• Reenskaug, Trygve (2006). MVC and DCA: Two complimentary system architectures.
• Reenskaug, Trygve (2004). Empowering People with BabyUML. A Sixth Generation Programming Language. Show summary

  I regard BabyUML as a sixth generation language because it combines the algorithmic capabilities of the third with the semantic modelling of the fourth. The third generation includes languages such as FORTRAN, Algol, Java, and C#. They are all computation-centered languages and their metamodel is defined in terms of symbols composed of text strings. The fourth generation languages are storage-centered and include languages such as NIAM and E-R. (Languages for artificial intelligence are commonly known as fifth generation languages. We ignore them for the time being so the next generation becomes the sixth). BabyUML is a communication-centered language based on communicating objects. It has a powerful metamodel based on the OMG Meta Object Facility (MOF) and exploits the strong input output facilities of current computers to support programs that can usefully be seen from multiple perspectives, using text, tables and graphics for effective communication between man and computer. The foremost motivation for developing BabyUML is ethical; we need information systems that can be mastered by users and programmes alike. The systems should be transparent and tangible so that a person can explore them, understand them and even modify them. BabyUML also breaks with tradition by replacing the idea of a closed application with an open module that is created within a running context. Current programming technology calls for a four stage process: modelling, coding, loading, and execution. BabyUML merges them into one, making programming a question of dynamically modifying a running system. My first experiments are based on Squeak, an open source variant of the Smalltalk information environment. I have chosen Squeak as my laboratory because it makes it easy to test out new dynamics, languages, tools, and architectures that I want to develop for BabyUML.

• Reenskaug, Trygve (2004). IS21C: Information Systems for the 21st Century. Show summary

  Introducing Squeak, an open source variant of the Smalltalk information environment. I have chosen Squeak as my laboratory because it makes it easy to test out new languages, tools, and architectures that I need for the Information Systems of the 21st Century.

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