Axiomatic Design (AD) can be used to give insight into the degree of coupling found in a system (among several other important uses). This then provides the opportunity for coupling and complexity to be controlled and reduced by design. This paper presents a case-study based on a thermal package that uses an exothermic chemical reaction to produce heat thereby replacing heating systems currently used that use combustion reactions involving ethanol and/or methanol. We explore coupling, reangularity (AD), semangularity (AD), and ideality (from TRIZ). We present the design matrix, cascading, information content, isograms, the p-diagram, robustness, signal-to-noise ratio,  bias, capability, and an ideality model based on a decomposition of the design matrix.

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