3. Clearly state the purpose and limits of the study

Designing a system with performance objectives such as resistance, endurance, pleasure, etc. For the characterization of functions (see Organic classification of functions [FIC 0618] ), it's :

• Knowing exactly what is expected of the product or system: external functional analysis (EFA) translates user expectations into functions, and expresses these needs in the form of functional specifications (FSC).

• Find out what the study will be used for:...