- The problem with visual programming is that you can’t have more than 50 visual primitives on the screen at the same time.
The term was made up by Fred Lakin, after Deutsch made the following comment at a talk on visual programming by Scott Kim and Warren Robinett: "Well, this is all fine and well, but the problem with visual programming languages is that you can’t have more than 50 visual primitives on the screen at the same time. How are you going to write an operating system?"
The primitives in a visual language are the separate graphical elements used to build a program, and having more of them available at the same time allows the programmer to read more information. This limit is sometimes cited as an example of the advantage of textual over visual languages, pointing out the greater information density of text, and posing a difficulty in scaling the language.
However, criticisms of the limit include that it is not clear whether a similar limit also exists in textual programming languages; and that the limit could be overcome by applying modularity to visual programming as is commonly done in textual programming.
- Comp.Lang.Visual - Frequently-Asked Questions List. Most recent update: 10 March 1998 David McIntyre. "The comp.lang.visual FAQ".
- LogoBlocks: A Graphical Programming Language for Interacting with the World. Begel, A. (1996). (AUP), Cambridge, MA: MIT Media Lab
- Animatronics, Children and Computation. Andrew Sempere
- Torben Weis, Mirko Knoll, Andreas Ulbrich, Gero Mühl, Alexander Brändle. "Rapid Prototyping for Pervasive Applications." (PDF). Archived from the original (PDF) on 2012-04-21.
- Emerging Frameworks for Tangible User Interfaces. Brygg Ullmer and Hiroshi Ishii
- Token+Constraint Systems for Tangible Interaction with Digital Information. Brygg Ullmer, Hiroshi Ishii and Robert J. K. Jacob
- Parsons and Cranshaw commentary on Deutsch Limit in "Patterns of Visual Programming"
- Baeza-Yates commentary on Visual Programming
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