lecturer 17

8/6/2019 Lecturer 17

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Statistical Quality Assurance

� Implies information about software defects is

collected and categorized .

� An attempt is made to trace each defect to its

underlying cause.

� Isolate the vital few causes of the major source of all

errors.

�Then move to correct the problems that have causedthe defects.



Categories of Errors for statistical Quality

assurance

� Incomplete or erroneous specification (IES)

� Misinterpretation of customer communication (MCC)

� Intentional deviation from product specification (IDS)

� Violation of programming standards (VPS)

� Error in data representation (EDR)

� Inconsistent module interface (IMI)

� Error in design logic (EDL)



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� Incomplete or erroneous testing (IET)

� Inaccurate or incomplete documentation (IID)

� Error in programming language translation (PLT)

� Ambiguous or inconsistent human-computer interface

(HCI)

� Others.



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� Ei = The total number of errors uncovered during theith step in the software development process.

� Si

= the number of serious errors.

� Mi = the number of moderate errors.

� Ti = the number of minor errors

� PS = size of the product (LOC, Function Point)



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� Phase index for each step is given by.

PIi = ws(Si/Ei)+wm(Mi/Ei)+wt(Ti/Ei)

Where µw¶ = Weight for each error.

There fore the error index is calculated as,

( ) /( ) /

i PI PS PI PI PI iPI PS

X i

i§! 1 2 32 3



Total Quality Management (TQM)

It involves the continuous improvement of organizational processes, resulting in high quality productsand services.

In other words it is a way of managing people and business processes to ensure complete customer satisfaction at every stage, internally and externally.

TQM functions on the premise that the quality of products and processes is the responsibility of everyonewho is involved with the creation or consumption of the products or services offered by an organization.



TQM Framework



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The core of TQM is the customer-supplier interfaces,and at each interface consists a number of processes.

This core must be surrounded by commitment to

quality.

communication of the quality message.

Creation of a culture in which all members of the

organization participate in the improvement of the

process, products and services.

They are supported by the key management functions

of people, processes and systems in the organisation.



K ey elements of TQM system

Customer focus: The objective is to achieve total

customer satisfaction. Customer focus includes studying

customer¶s need, gathering customer¶s requirements,

and measuring and managing customer¶s satisfaction.

Process: The objective is to achieve continuous

process improvement. This elements includes both the

business process and the product development

process. Through process improvement product qualitywill be enhanced.



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Human side quality: The objective is to create a

company wide quality culture. Focus areas includes

leadership, management commitment and total

participation.

Measurement and analysis: The objective is to

drive continuous improvement in all quality parameters by the goal oriented measurement system.



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lecturer 17

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