PERFORMING QFD STEP BY STEP

by Kenneth Crow
DRM Associates

Use by University Learning Institute explicitly granted.

QFD uses a series of matrices to document information collected and developed and represent the team's plan for a product. The QFD methodology is based on a systems engineering approach consisting of the following general steps:

  1. Derive top-level product requirements or technical characteristics from customer needs (Product Planning Matrix).
    Develop product concepts to satisfy these requirements.
    Evaluate product concepts to select most optimum (Concept Selection Matrix).
    Partition system concept or architecture into subsystems or assemblies and flow-down higher- level requirements or technical characteristics to these subsystems or assemblies.
    Derive lower-level product requirements (assembly or part characteristics) and specifications from subsystem/assembly requirements (Assembly/Part Deployment Matrix).
    For critical assemblies or parts, flow-down lower-level product requirements (assembly or part characteristics) to process planning.
    Determine manufacturing process steps to meet these assembly or part characteristics.
  2. Based in these process steps, determine set-up requirements, process controls and quality controls to assure achievement of these critical assembly or part characteristics.

The matrices and the specific steps in the QFD process are as follows.

Gather Customer Needs

Product Planning

Concept Development

Subsystem/Subassembly/Part Deployment Matrix

An Example