Updated on February 5, 2025

Key disadvantage

Key disadvantage is a disadvantage selected to be eliminated to achieve the goal of the project. Usually, key disadvantages appear at the root of cause-effect chains.

Overview

The initial disadvantage is always predetermined by the goal of the project. The selection of key disadvantages is your decision.

Usually, key disadvantages can be found at the roots of cause-effect chains or close to them; however, the its status can be assigned to any intermediate disadvantage of the chain.

Relation between key disadvantages and key problems

Some of key disadvantages are directly reformulated into key problems, the others can be used in trimming. The component immediately associated with the key disadvantage may be trimmed from the system, thus, the key disadvantage disappear together with the trimmed component and trimming problems are generated instead.

Another scenario includes performing feature transfer on the component associated with key disadvantage. It generates a set of feature transfer problems.

Trimming problems and feature transfer problems have the status of key problems.

Recommendations

It is recommended to examine the entire chain when selecting key disadvantages. Some disadvantages may be easy to eliminate, or certain issues might have already been resolved in the past. Consider who could assist you in this process.

A key disadvantage formulated around a parameter is usually easier to model using an engineering (technical) or physical contradiction. For example, if the key disadvantage is that an element is too thin, it can be relatively straightforward to model it as a physical contradiction: the element should be thick because…, and it should be thin because…

Consider the disadvantages located in the branch containing the AND operator – removing one can eliminate (collapse) the entire branch or part of the chain.

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