ADMS 4245 Chapter Notes - Chapter 5: Consumer Reports, Popular Science

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CHAPTER 5 – Product Specification
The customers’ needs data gathered is information; however, it is hard to answer the question
how to do that product in terms of design and engineering. Development teams usually
establish a set of specifications, which spell out in precise, measurable detail what the
product has to do. Product specification do not tell the team how to address the customer
needs, but they do represent an unambiguous agreement on what the team will attempt to
achieve in order to satisfy the customer needs. Some firms use “product requirements” or
“engineering characteristics”. A specification consist of a metric and a value. For example,
“average time to assemble” is a metric, while “less than 75 seconds” is the value of this
metric.
When are specification established?: in a perfect world, the team would establish the
product specification once early in the development process, then design and engineer the
product to exactly meet those specs. This will work for products such as soap or soup.
However, for technology-intensive products is rarely possible. For technology products,
specifications are established at least twice. Immediately after identifying the customers
needs, the team sets target specifications.
Establishing Target Specifications: the target specifications are established after the
customer needs have been identified but before product concepts have been generated and the
most promising one(s) selected. However, in some cases it is not technically feasible e,g, in
designing a suspension fork, the team cannot assume in advance that it will be able to achieve
simulatenously a mass of 1 kg with a manufacturing cost of $30. This preliminary
specifications are labeled “target specifications”
Establishing the target specifications contains four steps:
1. Step 1: Prepare the list of metrics: the most useful metrics are those that reflect as
directly as possible the degree to which the product satisfies the customer needs. The
relationship between needs and metrics is central to the entire concept of
specifications. The working assumption is that a translation from customer needs to a
set of precise measurable specifications is possible and that meeting specifications
will therefore lead to satisfaction of the associated customer needs. For example, the
customer need was to reduce vibrations in the bicycle “a dropout to handlebar at 10
hz”. A few guideline should be considered when constructing the list of metrics:
Metrics should be complete: Ideally, each customer need would correspond
to a single metric, and the value of that metric would correlate perfectly with
satisfaction of that need.
Metrics should dependent, not independent, variables: specifications also
indicate what the product must do , but not how specification will be
achieved. Designers use many types of variables in product development;
some are dependent, such as the mass of the fork, and some are independent,
such as the material used for the fork. You cant control the mass of the fork
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Document Summary

Chapter 5 product specification: the customers" needs data gathered is information; however, it is hard to answer the question how to do that product in terms of design and engineering. Development teams usually establish a set of specifications, which spell out in precise, measurable detail what the product has to do. Product specification do not tell the team how to address the customer needs, but they do represent an unambiguous agreement on what the team will attempt to achieve in order to satisfy the customer needs. A specification consist of a metric and a value. : in a perfect world, the team would establish the product specification once early in the development process, then design and engineer the product to exactly meet those specs. This will work for products such as soap or soup. For technology products, specifications are established at least twice. The relationship between needs and metrics is central to the entire concept of specifications.

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