Hi everyone and wellcome back, I know that it has been a while since the last time we talked but now we have another topic to discuss and know about, and this time is going to be about how to properly do a V&V in every proyect, about the methodology and step by step on how to niceli finish a V&V process.

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V&V in the life cycle of software development

At this point if you were reading my blog you’ll probably know about the life cycle, which is the flow of life in every system, it determines the objective of a system, when it was born, when it develops and when it is expected to end its life, in other words when the system has already completed its purpose of existing.

Of couse if we talk about Verification and Validation first we need to describe what are these:

• Verification: when the product is being built right
• Validation: when people are building the right project

In other words Verification checks if that they are building the system the right way, and Validation checks that the product that they are building is the one who si going to complete the main objective

To describe its aplications to this topic fist we are going to use a life cycle model as an example:

In this model the life cycle of the system is descibred in 4 phases

• Initiacion
• Planning
• Execution
• Closing

Initiation: In this phase the idea of the product that is going to be built is being processed, Verification in this phase is going to be in charge of making sure that the model the idea of making the product is right. Validation makes sure that the product must fullfill the main objective

Planning:In this phase how the model is going to be built is being processed. Verification the going to check that the procedure that is goign to be followed is the correct one. Validation: is going to check that the procedure taken keeps following the main objective.

Execution: In this phase the system is now being built, following the procedure previously established. Verification checks that the procedure is following the objective of the system. Validation checks that the procedure is going to finish a project that fulfulls the main requirements.

Closing: in this phase the end of the system finally is reached. Verification checks that the product was built right. Validation checks that the final project fulfills the objective established in the first phase.

With this example you now probablly know a little bit more about how to implement V&V during a lyfe cycle of a system.

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International standars for V&V of software

Because V&V are models to evaluate the levels of goodness there are some standars that describes a level of quality for some saying, and these standars rely on rules that need to be followed and level of achieveness acomplished.

Some of the standars implemented in V&V are:

• ISO/TS 17033
• ISO 14021
• IEC 17029
• IEEE
• ISO 9000
• ISO/IEC 15408
• IEC27001

These standars describe the level of achieveness of a system, every one of these standars descibre a diferente level of achieveness, if you want to knoe a little more about the standars pleas check out this link.

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How to plan V&V

In order to do a correct planning about V&V some phases needs to be analyzed and described to finally do a V&V process.

This process is kinda similar to a lyfe cycle, but with more in deph about what needs to be planned before or to be prepared to do the V&V planning.

• Requirements: Validate the requierements of the system and verify that are acomplisable
• Architecture and Design: Validate that the sistem is well designed and runs according the objective of the system. Verification to check non functional requirements
• Implementation: in each procedure implemented check that follows that the software must suceed and do some testing about in each implementation
• Testing: checks that all functionalities of the system meets the requiremens previously established and to make sure that everything works as expected
• Deployment: comfiguration and instalation must run as expected with no bugs and errors

Following these phases when building you ensure that your system is optimal to do a V&V implementation of the system, and now it is time to select one or more standars to meassure the level of V&Vness.

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Administrating the V&V Plan

This is probably one of the easiest topics to discuss because in the previous entry we discussed about the diferenece, how to implement, and measure the level of V&Vness which results in a very easy way to administrate the V&V plan.

Procedure to administrate the V&V plan:

• Explain the objetives of the project
• Document all the implemented functions and sequences
• Make sure to test all cases to avoid bugs
• Make sure to aproeach the system in a way that nothing stays outside the evaluations
• If bugs found make sure to document which bugs occurs, under which circumstances and if corrected the way to corrected, to make sure that if some kind of similar bug occurs now there is a way to correct it
• Make sure that procedures can run under any enviroment, if not make sure to run on at least most of them, and to acknowlegde which requieremnts are needed.
• To ensure a bidirectional comunication with the customer, to keep updated all of the involved
• Run updates to the system and maintenance
• ALLWAYS document everything that happens in the system, bugs, errors, implementations, everything.
• Make sure that the end of the system is defined and to redo the planing until a level of V&Vness is adquired.

With this procedure now we can make sure that you are now ready to do a good V&V implementation in your systems, I only recomend doing this if your project is big enough or if you want your project to be as clean as posible.

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