Default Case Study Guide: Smart IoT Lock

Quality Function Deployment (QFD) Suite

A tool to convert qualitative customer needs into quantitative engineering specifications and design benchmarks.

Select Workspace Mode

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SecuTech Smart IoT Lock parameters. Automatically fills out the entire matrix.

Clear & Enter My Own Data

Flushes the active workspace parameters so you can enter your custom specifications.

What is House of Quality?

The House of Quality is the core matrix of **Quality Function Deployment (QFD)**. Developed in Japan by Yoji Akao in 1966, it acts as a conceptual map linking customer voices (WHATs) directly to manufacturing and engineering parameters (HOWs).

By resolving conflicts (the Roof), analyzing competitors, and scoring priorities, designers can focus resources on design specs that maximize customer satisfaction.

Priority Formulas

Engineering Absolute Importance Score:

\[W_{abs, j} = \sum_{i=1}^{n} (R_{i,j} \times I_i)\]

Where \(R_{i,j}\) is relationship weight (9, 3, 1) and \(I_i\) is customer importance (1–5).

Relative Engineering Weight (%):

\[W_{rel, j} = \frac{W_{abs, j}}{\sum_{k} W_{abs, k}} \times 100\%\]

Step 1: Customer Requirements & Importance

List what the customer expects from the product. Rate each from 1 (lowest) to 5 (highest importance).

Customer Requirement (WHAT) Importance (1.0 - 5.0) Action

Step 2: Technical Design Characteristics

Define how the company can address customer needs. These should be measurable engineering metrics.

Design Characteristic (HOW) Unit Direction Action

Step 3: Inter-Relationship Matrix

Quantify how strongly each Technical Spec (HOW) impacts each Customer Need (WHAT). Select (9) for Strong, (3) for Medium, (1) for Weak, or blank for None.

Step 4: Engineering Spec Correlations (The Roof)

Map correlations between different Technical Specs (HOWs) to resolve design conflicts. If improving Spec A degrades Spec B, mark as Negative. If it aids, mark as Positive.

Design Spec A Design Spec B Correlation Impact

Step 5: Market Performance Benchmarking

Rate customer perception of performance (1–5 Scale) for your company and core competitors on each Customer Requirement.

Step 6: Engineering Targets & Competitor Tech Benchmark

Establish target values and list competitors' technical scores for each engineering specification.

Synthesized House of Quality

Calculated priorities, competitor rankings, and technical targets consolidated into the master HoQ diagram.

Lean Quality & QFD Decision Advisor

Load active values from the House of Quality workspace to synthesize strategic recommendations, trade-off solutions, and expert literature guidance.