Design and Development - Review vs. Verification vs. Validation

S

Sardokar

#1
Hello

could you please clarify in a few sentences (with a practical exemple if possible) the difference between Design and development review/verification/validation ?

My main problem is the difference between review and verification really


EDIT : Also, is a Prototype considered a full product ?

And is a prototype Reviewed, verified or validated ( Or all at the same time ??? )

By who?

Thanks
 
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qusys

Trusted Information Resource
#2
Review aims at evaluating the results vs requirements as well as monitoring a project of a product vs time, costs and quality parameters.

Verification is aimed at verifying if the outputs of design meets the inputs of design.

Validation is aimed at verifying if the product/process meet the requirements for intended use

If you use PPAP method and APQP , its phases drive the process of product/process design and development :bigwave:
 

Jim Wynne

Staff member
Admin
#3
Hello

could you please clarify in a few sentences (with a practical exemple if possible) the difference between Design and development review/verification/validation ?

My main problem is the difference between review and verification really
"Review" normally applies to the D & D process, while verification and validation most often refer to design output (although verification may apply in either case) For example, a design review might consist of a sort of audit that verifies that the design process requirements (e.g., review of requirements, specifications, general feasibility, proper documentation) have been met. Design verification might include measurement and other activities intended to verify that a product (which could be a prototype) meets the general specifications, while validation normally verifies that the product will fit and function as intended.


EDIT : Also, is a Prototype considered a full product ?
A prototype may or may not be a saleable product. Some prototypes might be made from materials other than the ones intended for production parts, or may lack finishing or other secondary processes.

And is a prototype Reviewed, verified or validated ( Or all at the same time ??? )
Any of those things might be applied to prototypes. There are generally no hard-and-fast definitions of any of those terms, and as such they're subject to local interpretation.

Could be anyone; it's generally expected that designers will participate in most activities relative to ensuring that design intent is satisfied, and that the product will perform as intended, but the general process might involve people from quality, manufacturing, purchasing, and any other function that might have an interest in the product.
 
P

pldey42

#4
Review - look at the drawings and see if the radio is likely to work. While the designers might be involved, get other engineers (working on a different radio) to look at it with an independent eye. Maybe also get some manufacturing engineers and maintenance engineers to look at it too for problems we might encounter in their areas. Perhaps get some potential customers to look at it as well, for they might have ideas about the look and feel.

Verification - test and inspect it against the design specs. The testers and inspectors should be independent of the design and manufacturing people.

Validation - give some prototypes to a representative sample of customers to find out if it really works. They'll find errors in the specs, and think of things to do to it that never got into the specs.

Prototypes enable verification and validation before going into full production. Verification and validation continues through the life of the product, often on a sampling basis and especially when there are changes. Reviews are repeated when there are changes, to see that the change is likely to work.

The idea of all these activities is to detect nonconformities as early as possible, when they are cheapest to fix. This is the cost-benefit justification to use when managers want to spend as little as possible on such activities - they're actually an investment in reducing costs of warranty, repair etc.

They're generally done by independent people because nobody likes saying their baby isn't perfect, and indeed we often have a blind spot to the imperfections in our creations.

Hope this helps,
Pat
 
S

Sardokar

#5
Are documents/records that are created by the design and development teams considered OUPUTS too?

Example: Project Plan , detailed analysis report(That details how the solution will work)


or is the ouputs only Prototype/final product ??

If Project plan is an output is it Reviewed and Verified ? or just reviewed ?

Thanks
 
P

pldey42

#6
Yes, all the work-products that result from design are "outputs". The standard is written in this abstract fashion in order to be generally applicable. All the outputs would normally be reviewed, verified or validated as necessary in order to detect and eliminate errors as early as possible.

Thus, the design itself might typically be reviewed in paper form, verified and validated in prototype form, and (perhaps on a sampled basis) as it comes off production. Verification and validation would be performed using either inspections or tests.

A project plan would typically be reviewed with key people so that they can spot planning errors such as missing activities or over-optimistic time allocations. I do not recall ever having seen a project plan verified or validated, although I suppose one might verify a complex, mission-critical project plan with walk-throughs, where the key players meet and follow the plan like a script, each describing their activity to the team and being encouraged by visualizing it to spot errors.

A reliability analysis report might be an output of design and would be reviewed by engineers for accuracy. It might be verified or validated with some reliability trials on prototype product.

The standard is not prescriptive about which review, verification and validation activities should be performed. Rather, one uses it as a menu of ideas to consider when mapping out the processes. If design is not the quality manager's area of expertise, he or she might map the processes using some design experts and asking them which review, V&V activities they would recommend.

Hope this helps,
Pat
 
S

Sardokar

#7
Sorry, another question if i may :)

are some documents considered inputs and outputs?

I mean lets say we send the project plan to the customer

its an input to the customer (he reviews it) then for example the customer sends his change request (Output)

The change request is an input to us and we deliver to the customer an updated project plan (output)

The customer then reviews the input (updated project plan) and either approves or not..


Is this about right or are the inputs ONLY coming from customer?


Thanks
 

Stijloor

Staff member
Super Moderator
#8
Sorry, another question if i may :)

are some documents considered inputs and outputs?

I mean lets say we send the project plan to the customer

its an input to the customer (he reviews it) then for example the customer sends his change request (Output)

The change request is an input to us and we deliver to the customer an updated project plan (output)

The customer then reviews the input (updated project plan) and either approves or not..


Is this about right or are the inputs ONLY coming from customer?


Thanks
Inputs to a process can come from internal and external entities. In fact, in a process you can be your own supplier (input) and customer (output).

Stijloor.
 
P

pldey42

#9
That's right, documents are both inputs and outputs - inputs to processes and outputs from processes, whether internal, involving customers, or involving suppliers.

So the customer's requirement spec is an input to design, and the design specs or drawings are an output from design. The design specs and drawings are inputs to purchasing, and to manufacturing, and to manual writing, etc.

A design spec is an input to review with the customer, and also an input to internal review. The output of the review process is typically a review report which is an input into another iteration of design.

A document which is produced as an output, but which is not an input to some other process (internal or extermal) is redundant and should either be eliminated or used - and it happens surprisingly often.

IMHO good processes always use well-defined tangible inputs and outputs, things that can be checked with reviews, tests or inspections, often documents and records as well as things like components, sub-assemblies, prototypes and completed products.

Hope this helps,
Pat
 
Last edited by a moderator:

Jim Wynne

Staff member
Admin
#10
A document which is produced as an output, but which is not an input to some other process (internal or extermal) is redundant and should either be eliminated or used - and it happens surprisingly often.
Unless you have some kind of infinite progression, any document processing will come to a halt at some point, usually resulting in a record. In fact, in almost all cases of documents created in design and development, the end point is record-keeping.
 
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