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1 Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.2  AAS is used particularly for detecting the concentrations of metal ions in solutions. Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.
The After Action Review (AAR) is a simple option for facilitating this assessment. It works by bringing together a team to discuss a task, event, activity or project, in an open and honest fashion. The systematic application of properly conducted AARs across an organisation can help drive organisational change.