User-Centric Design Principles

One of the key success factors for any application or system is the way it was designed, and how easy for common users to understand how to use and interact with it and execute simple operations or tasks without prior training or manuals.

In this article, I will discuss seven key design principles introduced in Don Norman’s Design of Everyday Things. These design principles will help us design better for humans and to evaluate or critique any application design easily. The seven design principles are:

  • Conceptual Models
  • Gulf of Execution
  • Gulf of Evaluation
  • Visibility
  • Feedback
  • Mappings
  • Constraints
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Quality Function Deployment

Introduction

Quality Function Deployment was developed by Yoji Akao in Japan in 1966. By 1972 the power of the approach had been well demonstrated at the Mitsubishi Heavy Industries Kobe Shipyard [1]and in 1978 the first book on the subject was published in Japanese and then later translated into English in 1994. [2]

The QFD methodology can be used for both tangible products and non-tangible services, including manufactured goods, service industry, software products, IT projects, business process development, government, healthcare, environmental initiatives, and many other applications.

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