Systems Thinking and Systems Engineering Verification & Validation 14 March 2013 Francois Christophe Galina Medyna Eric Coatanéa

Verification & Validation What? And When? Informal FormalVerification Validation

Verification

Verification: Datasheet example

Verification Datasheet parameters, values and graphics –Where does all that come from? They are the results of tests –Tests of components are performed on a representative sample –How are the tests planned and prepared? Tests are prepared based on specific performance needs and based on standards –Different types fo standards acoording to specific needs –E.g. Civilian standards, Military standards, Aerospace standards

Verification: Example of test procedure

Verification: Definition Verification during development: –Perform tests on model –Simulate part or whole of the system –Perform review of the results of simulation Verification after development: –regularly repeating tests to ensure that the system continues to meet the initial design requirements, specifications, and regulations as time progresses –process used to evaluate if the system complies with regulations, specifications imposed at the start of development

Validation

What is it? A process, discussion between customers and firm who developed the system Why is it for? To ensure that the system meets the initial customers needs and expectations

Validation: definition Validation is used to check that development and verification procedures for a system result in a system that meets initial requirements, specifications, and regulations Validation procedures involve: – modeling flow of system usage –using simulations to predict faults -> leading to invalid verification of a system Validation process provides a high degree of assurance that a system accomplishes intended requirements. This often involves acceptance of fitness for purpose with end users and other product stakeholders

Verification & Validation What’s the difference? Validation corresponds to "Are you building the right thing?“ Verification by "Are you building it right?“ "Building the right thing" refers to user's needs “Building it right" checks that specifications are correctly implemented A system can be verified but not validated: e.g. if specifications don’t meet user’s needs. Verification: internal process Validation: external process