Info
doubly underlined sets = major partial factors underlined sets = minor partial factors *on structural actions ton geotechnical actions
Sets A12 are applied to actions; M12 to material properties; R14 to resistance; E12 to action effects (using values from Sets A12).
Of the sixtythree partial factors specified in Annex A of EN 19971 for the GEO and STR limit states, just over half are numerically greater than one (the remainder are either unity or zero). In the table above, those sets in which the partial factors are significantly greater than one  and hence introduce reliability into the calculation  are doubly underlined; sets in which only one factor is > 1.0 or the factors are relatively small are singly underlined; and sets in which the factors are all unity are not underlined.1
In essence, Design Approach 1 provides reliability by applying different partial factors to two variables in two separate calculations ('Combinations' 1 and 2); whereas Design Approaches 2 and 3 apply factors to two variables simultaneously, in a single calculation  as summarized below.
Structure
Main variable that gets factored in Design Approach ...
Structure
Main variable that gets factored in Design Approach ...

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