Author Archives: chris

Application of the generational variety index: a retrospective study of iPhone evolution

iPhone Generations use in GVI analysis

The results of the analysis and subsequent design recommendations are compared with the actual design evolution of the iPhone product line. For certain subsystems, this comparison reveals a divergence in Apple’s design decision-making from the evolution recommended by the GVI technique.

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Strategic product design for multiple global markets

Three platforming strategies for global product design.

Based on an understanding of the current state of knowledge, this paper outlines three broad top-down design strategies to satisfy varying user, business, and regulatory requirements across target markets, and to do so in a resource-efficient manner.

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Techniques, tools, and representations for solving design problems considering anthropometry

Several of the information presentation strategies examined in this dissertation.

The quality of available education, solution techniques, and tools for designers considering user body size in the development of products and environments varies widely. The objective of this work is to investigate the current state of affairs in these areas, propose new or improved methods and tools where appropriate, and evaluate these tools.

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Optimization of product dimensions for discrete sizing applied to a tool handle

Handle performance plotted vs. the number of sizes.

Measuring the accommodation of a population across multiple sizes is shown to be a two-step process consisting of an assessment of performance for an individual followed by a comparison of that performance with an established standard across the population (i.e., in the current work, a term called grip quality, Q, is assessed for each user in a virtual population, and then all users with Q ≥ 0.95 are considered to be accommodated).

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A real options-based approach to designing for changing user populations of long-lifetime products

Accommodation levels for the unchanged, obese, and gender split population scenarios over the 31-year lifetime of the truck. Accom- modation is tracked for nine different decisions concerning the x-directional minimum seat position and seat adjustability.

In addition to robustness-related considerations, designers of long-lifetime products (e.g., freight trucks and commercial aircraft) must also account for possible secular and demographic trends and their impacts on the ranges of anthropometry, capability, and preference of user populations. However, the uncertainty associated with forecasts of these trends complicates the decision-making process of the designer. One of the decisions to be

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Probability of user fit for spatially optimized products

Probability of accommodation in design space for various limits on adjustability. Darker shades indicate adjustment limits with higher levels of predicted accommodation. The 1000- member virtual population is overlaid atop the contours.

This study offers a new method for understanding the likelihood of acceptable fit for users of adjustable products and environments and is a useful tool for aiding the designer in making decisions about problems involving human variability.

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