Functional analysis: classify and characterize functions - draw up functional specifications

The Functional Analysis (FA) of a product is the basis for drawing up the Functional Specifications (FSC), responding exactly to the user's needs. It can also be used as a basis for more comprehensive studies such as value analysis (VA), FMECA, etc.

In the previous steps, you have :

• carried out preliminary investigative work;

• Identify and order the functions (cf. sheet Product function types and function search method [FIC 0616] ) that reflect the user's needs;

• recognize the service functions (SF) and find the technical functions (TF), identify the constraints (cf. sheet Expressing constraints [FIC 0619] );

• for each phase of the product's life cycle ( see the sheet Studying the product life cycle for functional analysis [FIC 0655] ), you have created a function tree ( see the sheet The function tree [FIC 0617] ).

Now you need to classify and characterize product functions.

Several methods can be used. Depending on the complexity of the system being studied and the field you're...