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Last updated at 8:07 am UTC on 16 June 2018
BabyIDE is an interactive development environment written by Trygve M. H. Reenskaug in Squeak that supports the DCI (Data-Context-Interaction) paradigm with specialized browsers for each perspective. These browsers are placed in overlays within a common window so that the programmer can switch quickly between them. DCI with BabyIDE marks a new departure for object oriented programming technology.


The essence of object orientation is that networks of collaborating objects work together to achieve a common goal. The common sense of object oriented programming should reflect this essence with code that specifies how the objects collaborate. Our industry has, unfortunately, chosen differently and code is commonly written in terms of classes. A class tells us everything about the properties of the individual objects that are its instances. It does not tell us anything about how these instances work together to achieve the system behavior.

The result is that our code does not reveal everything about how a system will work. This is clearly not satisfactory, and we need a new paradigm as the foundation for more expressive code. The DCI (Data-Context-Interaction) is such a paradigm. DCI separates a program into different perspectives where each perspective focuses on certain system properties. Code in the Data perspective specifies how information is represented by stand-alone objects. Code in the Context perspective specifies runtime networks of interconnected objects as similar structures of interconnected roles. Code in the Interaction perspective specifies how the networked objects collaborate to achieve the system behavior.

A Squeak image illustrating this may be downloaded here.
That image also contains the BabySRE (Squeak reverse engineering tools, more).

BabyIDE contains the BabySRE tools. They may be loaded separately, see BabySRE.

Squeak 3.10.2 update #7179, November 2014