The n-dim
project
n-dim is a computer system and an approach
to study and improve design that takes the above premise seriously. The
principal work on the project is done at the Engineering
Design Research Center at Carnegie
Mellon University,
Pittsburgh, PA.
The n-dim home page contains
additional information about the project.
n-dim can be used to
build arbitrary models from objects. Models can be informal, like the one in
the figure below, or formal such as Petri nets, conceptual graphs, etc.
The model in the Figure "behaves" like it would when viewed in n-dim.
That is, one can click on an object and the model will be "opened".
In the figure, clicking will lead you to the corresponding page. An object in a
model can be anything that can be electronically stored. When clicking on it,
it can behave as defined by the user.
The model in the figure was created with the Universal language, which
allows any objects and links to be incorporated in a model. The user can easily
create other languages that restrict the nature of objects and links and also
assign semantics with them. Through this, user can define languages that range
from informal to formal and use them.
As an example of the ease of creating a
language consider the figure below. In the top right model (labeled
"Systematic Diagram Language") we see how the user defines a model
consisting of an object Entity and a link labeled sub. This model
is written in the Universal modeling language. In the bottom right model
(labeled "Entity") the user incorporated three objects: Function,
Behavior, and Structure. This model was created with the GlassBox
whose meaning is explained below. So far, these models are models as the one
shown in the previous figure. However, the user can use models in different
ways. One way is to use models as definitions of languages (see the open menu
in the top right model). The top left model was created by using the Systematic
Diagram Language model as a language. As such, the only types of objects
possible are of type Entity and the only links possible are of type sub.
The type Entity is further defined by the "Entity" model and
through the meaning of the GlassBox language to be one of Function,
Behavior, or Structure. Thus, with great ease, the user has
created a new modeling language capable of describing functional, behavioral,
and structural decomposition diagrams.
Additional screen dumps showing how n-dim might be used can be viewed
in the papers below. In particular, the Computer-Aided
Participatory Design paper contains an illustration of how n-dim
could be used to facilitate true participation by illustrating it through a
plausible project that deals with the design of community library.
The n-dim approach to studying and supporting design:
At the foundation (1), there is a software infrastructure designed to
address design contexts and also designed to scale up to handle real
applications. As additional applications are developed, n-dim would
include repositories of various blocks for building applications (2). At the
top level (3), our research and development follows the philosophical positions
and theories we developed and evolved through empirical studies. These theories
guide us in future studies and development projects, and are subject to
constant reflection and potential revisions (4).
A project starts as a collaboration with industrial or other partner(s). In
order to support design and study it at the same time, we adopt participatory
action research (PAR) as our development methodology.
Together with our collaborators, we study the present state of information
management in the organization. The bottlenecks and their severeness suggest
priorities in setting goals for collaborative projects. We jointly define the
project goals (5). The development process (6) uses the infrastructure and
reuses the repositories of previous blocks (7) for prototyping the application
(8). This development, in turn, enriches the repositories and the
infrastructure. The application is deployed and tested by its end-users. This
process iterates until the goals, as understood at each iteration, are
satisfied by the evolving application (9). During the evolution, parts of the
system that become stable can be re-written quickly in more efficient code. The
collaborative project is studied and reflected upon continuously to uncover
potential improvements to all aspects of the methodology (10). Its results are
used to refine our theories (11). During such projects we also identify
critical areas for basic research, prioritize and execute them.
Our hypothesis is that this process supports the development of support
systems in the best way we know. We have developed a collection of tools that
supports the execution of this process (Subrahmanian et al.,
1997).
n-dim ideas have impact or strong association with the following
topics:
- Computer-Supported
Cooperative Work (CSCW)
- Knowledge Management (KM)
- Intellectual Capital (IC)
- Information Modeling
- Agile Manufacturing
- Participation Action
Research (PAR)
- Participatory Design (PD)
- Information Retrieval (IR)
- Hypermedia
- Product Data Management
(PDM)
- Software/Design
Prototyping
- Database Management
Systems (DBMS)
- End-User Modifiability,
Usability
- Concurrent Engineering
- Design Rationale Capture
- Design Studies, Theories,
and Practice
- ... and more ...
The extent of these associations is discussed in the n-dim
papers.
- Reich, Y.,
Coyne, F. R., Konda, S., Monarch, I., Subrahmanian, E., and Westerberg, W.
A. (1993), Computer-Aided Participatory Design, White paper on the
use of n-dim as a support system for participatory design, 1992.
This paper discusses the underlying foundations for supporting
participatory design with computational tools. It introduces n-dim
and illustrates it through a plausible reconstruction of a participatory
design project for developing a community library. The paper includes many
screen dumps with their explanations.
(HTML
file)
- Reich, Y., Konda, S.,
Monarch, I., and Subrahmanian, E. (1992), Participation and Design: An
Extended View, In PDC'92: Proceedings of the Participatory Design
Conference, (Cambridge, MA), Muller, M. J., Kuhn, S., and Meskill, J. A.
(eds.), CPSR, Palo Alto,
CA.
This conference paper extends the ideas of participation in design as
appeared in diverse disciplines. concurrent engineering. The communication
facilities in n-dim
are discussed.
(Postscript
file, 177K)
- Subrahmanian, E., Konda,
S. L., Levy, S. N., Reich, Y., Westerberg, A. W., and Monarch, I. A.
(1993), Equations aren't Enough: Informal Modeling in Design, AI
EDAM, 7(4):257-274.
This paper puts forward the statement that much of design involves
informal modeling and analysis activities rather than the use of formal
models such as equations. Examples are described to support this argument
and an environment that supports such modeling and analysis activities
(i.e., n-dim)
is briefly described.
(Postscript
file, 375K; Zipped
PS).
- Subrahmanian, E., Coyne,
R., Konda, S. L., Levy, S. N., Martin, R., Monarch, I., Reich, Y.,
Westerberg, A. (1993), Support system for different-time
different-place collaboration for concurrent engineering, In Proceedings
of the 2nd IEEE Workshop on Enabling Technologies Infrastructure for
Collaborative Enterprises (WET ICE), pp. 187-191, IEEE Computer
Society Press, Los Alamitos, CA.
This conference paper that discusses the critical role of asynchronous,
rather than, synchronous communication as a key ingredient in
collaborative work or concurrent engineering. The communication facilities
in n-dim
are discussed. (Postscript
file, 124K)
- Reich, Y., Konda, S., Levy,
S. N., Monarch, I., and Subrahmanian, E.
(1993), New roles for machine learning in design, Artificial Intelligence
in Engineering, 8(3):165-181.
This paper reviews the present way of using machine learning in design and
criticize it as being restrictive. The underlying assumptions under
present use are discussed and new ways in which machine learning can be
used in design are discussed. The use of natural language processing (NLP)
techniques is discussed as well as the use of multiple machine learning
tools (multistrategy). The integration framework for all the techniques
is, as you have already guessed ... n-dim.
(Postscript
file, 783K)
- Levy, S., Subrahmanian, E.,
Konda, S. L., Coyne, R. F., Westerberg, A. W., and Reich, Y. (1993). An
overview of the n-dim environment. Technical Report EDRC-05-65-93,
Engineering Design
Research Center,
Carnegie Mellon
University, Pittsburgh, PA.
The original, tried and true, outdated EDRC tech report on n-dim. Quite a
lot of it is still valid, but take statements about implementation with a
grain of salt. We are planning a new, updated version of this, possibly
for publication. In the meantime...
(Postscript
file, 783K)
- Reich. Y. and the n-dim
Group (1995), A Human-Centered Enterprise Information System for Agile
Design, Proceedings of the 15th Israeli Conference on Advanced
Technologies in Engineering, Management, and Manufacturing, SME, p.
264-270.
(Postscript
file, 115K)
- Reich, Y., Konda, S. L.,
Levy, S. N., Monarch, I. A., and
Subrahmanian, E. (1996), Varieties and Issues of Participation and
Design, Design Studies, 17(2):165-180.
(Postscript
file, 170K)
Abstract: Participatory design is the antithesis to
traditional design in which designers are expected to exhibit their
expertise. The right to participate in design is often ignored and even
when it is accepted, many obstacles including perceived pragmatic/economic
deficiencies and organizational concerns, impede participation. This paper
criticizes the foundations of traditional design. It starts from the
premise that it is the right of all affected by a design to have an active
role in its development and that appropriate ways of exercising this right
can lead to better designs. Subsequently, the paper elaborates on some
properties of participation in various design disciplines and in particular
in the context of architectural design and urban planning. The paper then
presents an approach for participation founded on widening communication
channels between participants and briefly discusses the potential of
computer tools for supporting participatory design. Finally, the paper
briefly relates participation and design to several popular concepts such
as concurrent engineering, total quality management, and quality function
deployment.
- Subrahmanian,
E., Reich, Y., Konda, S. L., Dutoit, A., Cunningham, D., Patrick, R.,
Thomas, M., Westerberg, A. W. (1997), The n-dim Approach to
Building Design Support Systems, Proceedings of ASME Design Theory
and Methodology DTM '97 ASME, New York, NY.
(Postscript
file, 263K)
Abstract: Creating practical design support systems is a
complex design endeavor. We approach it with an evolutionary process, one
that studies the design information flow then builds and tests information
management support systems. Through our experience with industrial
partners we have evolved this process into a set of methods and tools that
implement these methods. We have evolved an infrastructure ure called n-dim,
that is composed of a small number of building blocks that can be composed
in ways that match the complexity of design contexts and work. We have
developed this infrastructure to be highly flexible so as to allow us to
conduct this evolutionary process in a practical project setting.
- Y. Reich, E. Subrahmanian,
D. Cunningham, A. Dutoit, S. Konda, R. Patrick, A. Westerberg, and the
n-dim group, “Building
agility for developing agile design information systems,” Research
in Engineering Design, vol. 11, no. 2, pp. 67-83, 1999.
[Get gzipped
postscript (last 4 figures missing)|Zipped pdf (last 4
figures missing)]
-
- Papers on the US side.
- MORE TO BE ADDED SLOWLY
BUT CONTINUOUSLY
Copyright © 2005 Yoram Reich
Page URL: http://www.eng.tau.ac.il/~yoram/ndim.html
Last
modified: 5/1/2005 10:16:00 PM