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Developing an Objectives-Constraints Tree. Creating a graphical representation of design objectives and constraints. Taken from engineering design: a project-based introduction by dym & little. The development of an Objectives-Constraints Tree proceeds from the Attributes List and PCC.

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Developing an objectives constraints tree

Developing an Objectives-Constraints Tree

Creating a graphical representation of design objectives and constraints

Taken from engineering design: a project-based introduction by dym & little


The development of an objectives constraints tree proceeds from the attributes list and pcc
The development of an Objectives-Constraints Tree proceeds from the Attributes List and PCC.

  • The hierarchy of the Objectives-Constraints Tree comes from the results of the Pairwise Comparison Chart.

  • Primary objectives are listed in the first level of the tree.

  • Secondary objectives are grouped as subsets of the primary objectives. The same concept holds for subsequent levels of the tree.

  • Constraints should be listed as a subset of related objectives.

  • The other objectives and constraints listed in the tree come from the Attributes List.

  • Objectives are listed in rectangular boxes, and constraints are listed in ovals.


Below is an example not exhaustive of an objective constraints tree for a ladder design
Below is an example (not exhaustive) of an Objective-Constraints Tree for a ladder design.

Objectives

Constraints


Below is an example not exhaustive of an objective constraints tree for a ladder design1
Below is an example (not exhaustive) of an Objective-Constraints Tree for a ladder design.

Subsets of “safe”

Subset of “marketable”

Objectives

Constraints