在產品設計上，產品造形在影響消費者意象感受與偏好上扮演了重要的角色。產品造形的定義，不僅決定了產品造形上描述的精確性，且有助於研究者或設計師釐清消費者意象感受與產品造形特徵之間的關聯性。因此，本研究提出一個數值化定義爲基礎的系統化方法(NDSA)，透過詳盡的產品造形定義，以建立產品造形特徵與其相對應意象感受的關係。在本研究中，已藉由一個餐刀產品造形的特定案例，舉例說明數值化定義爲基礎之系統化方法(NDSA)的可行性。

In general, the form of a product has a significant effect on the emotional response it induces in potential consumers. The product form definition provides a convenient means of establishing a relationship between the consumers' perception of a product and its form features. Accordingly, this study proposes a novel design approach, designated as the Numerical Definition-based Systematic Approach (NDSA), in which an explicit numerical definition of the product form is constructed and used to establish the correlation between the product form features and the consumers' perception of the product image. The feasibility of the NDSA methodology is demonstrated using the example of a knife form for illustration purposes.