The product design specification is the basic control and reference document that would include the outcomes of the product development exercise, and is the must to begin with and execute the design and manufacturing of any specific part or product. The quality function deployment tool provides the most crucial inputs in writing the product design specifications. Following are some of the important elements of a typical product design specification document. It is, however, not necessary that the product design specification document of any product will contain all these elements.
In-use purposes and market requirements
Title and Purpose or function of the product,
Predictable unintended use of the product,
Special features of the product,
What would be the competitive products?
What is the indented market and why there is a need for this product?
Relationship of the product to the other company products,
Anticipated market demand (units per year) and target price.
Functional Requirements
Functional performances such as flow of energy, information, materials,operational efficiency, accuracy, etc.,
Physical requirements such as shape, size, weight, surface finish, etc.,
Service environment such as storage and transportation requirement,
Life-cycle issues including useful life, reliability (mean time to failure), robustness,ease of installation, maintenance and repair, recyclability, etc.
Human factors including importance of aesthetics, ergonomics and user-training.
Corporate Constrains
Is there adequate time to design a quality product and its manufacturing process (time to market)
What are the requirements for manufacturing this product?
Do existing relationships with the suppliers pose any constraint on manufacturing?
Are there any constraints in using the trademark, logo, brand name?
What are the profitability and return on investment (ROI) that must be met?
The production team should follow professional ethics at every level of the design process when they are dealing with suppliers, dealers, corporate officials, society etc.
Social, Political and Legal Requirements
The product design specification should meet / contain all the requisite safety and environmental regulations.
The product design specification should contain all the required standards,
The product design specification must be completed with respect to all safety and liability norms,
The product design specification should consider all the information related to the patents and intellectual property that are applicable.
Product Design Specifications (PDS) is explained with the following example in which the PDS is done for an adjustable wheel chair.
Similarly, other dimensions of the wheel chair can be set. However, the criteria are not only based on the performance. There can be other criteria as well like aesthetics, life in service, legal (Patents, Product Liability) and so on. One of them is shown below.
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