QA is nothing but Design the process and monitoring the 
process from starting(Invigilator)

QC is nothing but checking the process without prior 
intimaton (Squad)

QA is oriented to DEFECT PREVENTION. And in this we'll 
mainly concentrate on the PROCESS. QA'll exist in the 
entire life cycle of the software development. so we can 
call it as staff function.

QC is oriented to DEFECT DETECTION AND CORRECTION. In this 
we'll concentrate on the PRODUCT. In this QC is only 
testing people'll involve so that we can call it as a line 
function.

Let me know if i'm wrong. 
Thank you :)

QA:the process of evaluating overall projects performance 
on a regular basis to provide confindence that the projcect 
wil satisfy the relevant quality standards 
Quality managemet Plan results of quality control 
measurements are used to in the process.
quality planning tools and techiniques and quality audits  
are the methods used

QC:  it is the process of monitoring specific projects to 
determine if they compley with relevant quality standards 
and intentifying the causes of unsatisfactory performance
The mthods used are inspecton, contorl charts 
on the basis of work results and quality management plan qc 
wiil be done

QA :-----

A planned and systematic set of activities necessary to 
provide adequate confidence that requirements are properly 
established and products or services conform to specified 
requirements.

An activity that establishes and evaluates the processes to 
produce the products

Helps establish processes.

Sets up measurements programs to evaluate processes.

Identifies weaknesses in processes and improves them.

QA is the responsibility of the entire team.

Prevents the introduction of issues or defects

QA evaluates whether or not quality control is working for 
the primary purpose of determining whether or not there is 
a weakness in the process.

QA improves the process that is applied to multiple 
products that will ever be produced by a process.

QA personnel should not perform quality control unless 
doing it to validate quality control is working.

QC : ----

The process by which product quality is compared with 
applicable standards; and the action taken when 
nonconformance is detected.

An activity which verifies if the product meets pre-defined 
standards.

Implements the process.

Verifies if specific attribute(s) are in a specific product 
or service

Identifies defects for the primary purpose of correcting 
defects.

QC is the responsibility of the tester.

Detects, reports and corrects defects

QC evaluates if the application is working for the primary 
purpose of determining if there is a flaw / defect in the 
functionalities.

QC improves the development of a specific product or 
service.

QC personnel may perform quality assurance tasks if and 
when required

i think this is enough ........

enjoy...

In a Nushell 
     QA - Defect Prevention Process(Verification)
     QC - Defect detection and  Removal process(validation)
QA includes Walkthroughs,Reviews,Auditings,Inspections,
            Metting..etc
QC means actual testing process.

anyway the intention of the two processes is to give a 
quality product to the customer.
if the process is quality oriented then the product will be 
a quality one.

   rajendra_penumalli@yahoo.com

Hai,
According to me 
QA: Quality Assurence:
1.QA is organization level activity,
2.QA main role is prevent the defects
QC:Quality Control
1.QC is product level activity
2. QC main role is detect the defects.

Hai,

QA: 
  QA is the set of rules and procedures which is 
implemented in an organizations to achieve product quality.

QC:
  QC evaluate the system by comparing the expected output 
with that of actual output.

 If am wrong Please correct me......

  Byeeeeeeee friends