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Mohammad Zaid http://iso-qms.blogspot.com/
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Good Requirements Specification - How to obtain it?
Here are some excellent practices for obtaining
goodrequirements:
Define your goal clearly at the start. Are you seeking to define
a new product?
Are you seeking to learn about what your customers do and don t
l ike about your current
product? Are you seeking to compare customer opinions of your
product or service and
your compet it ors ? Are you seeking to determine what specif ic
changes to your product or
service the customers most want?
Make it int eract ive. We learn more by letting customers try
out or taste or play with a
sample or prototype than we do by asking questions. We want the
customers focused on
the product, not on us. If a prototype or sample isn t possible,
then we should use
pictures, charts, and diagrams.
Record everything. If possible, videotape or audiotape the
sessions. If not, have two
note takers so you lose as little as possible.
Use indust ry best pract ices, such as focus groups and
structure requirements elicitationmethods.
Learn and use good survey design. Good surveys are harder to
make than you would
think. McGraw-Hil l s Business Statistics Demyst if ied is a
great place to start .
Study your result s. Don t j ust gather a lot of data and ignore
it . Put it all t ogether and
learn what you need to know. Quality Management Demystified will
help with many
analyt ic t ools, t he most important of which is plan, do,
check, act (PDCA).
Check and test your r esult s. If you have a limit ed set of
customers, or customer
representatives (such as a market ing depart ment), have them
check and improve what you
come up with from the sessions before it goes final. Otherwise,
use multiple methods,
such as a survey, a focus group, and a limited pilot product
launch before you go into full
production.
Af ter elicit ing requirement s, we wil l need t o organize t
hem into a clear, useful
requirement s specif icat ion. The best descript ion for what
makes a good requirements
document is f rom the Inst i t ute of Elect ri cal and Elect
ronic Engineers, in t heir Standard
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Mohammad Zaid http://iso-qms.blogspot.com/
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830-1993, IEEE Recommended Pract ice for Software Requirements
Specif ications,
summarized here in Table:
Some Characteristics of a Good Requirements SpecificationAdapted
f rom IEEE standard 830-1993 and Creat ing a Software Engineering
Cultureby Karl E. Wiegers
Characteristic Description
Complete Nothing is missing; all att ributes relevant to
customer satisfactionare included, defined, and given
tolerances.
Consistent The specif icat ion contains no int ernal contradict
ions.
Correct The specifi cation accurately ref lects customers
andstakeholders wants and needs.
Feasible Delivering to the specif icat ion is possible with
technology that is
available, can be obtained, or can be developed. Delivering
tothe specification is possible within time, cost, and
otherconstraints.
Modif iable The specif icat ion is designed so that future
changes can be madein a defined, practical, traceable way.
Necessary Each requirement adds value for the customer.
Priori t ized Requirements are ranked as to how essential it is
to include eachin the book. A group at the top may be listed as
required, andthen optional ones listed below that, in priority
order.
Testable Each requirement must be defined in a way that wil l
allow forone or more tests of either process or product that wil l
ensure
conformance and detect error.Traceable Each element is uniquely
ident if ied so that it s origin and purpose
can be traced to ensure that it is necessary, appropriate,
andaccurate. This usually means assigning a number or code t o
eachrequirement that doesn t change, and then adding codes
toindicate changes to a requirement and giving each newrequirement
its own code or number.
Unambiguous Each requirement has only one possible int
erpretation.
For Article on Quality visit my
bloghttp://iso-qms.blogspot.com/
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