There are two main classes of adjectives in Italian. They stem from the corresponding Latin classes
- bonus, bona, bonum (first class)
- brevis, breve (second class, same form for masculine and feminine)
The first class adjectives became like
buono, buona, buoni, buone
where distinct forms exist for masculine singular (buono), masculine plural (buoni), feminine singular (buona), feminine plural (buone)
The second class adjectives became like
breve, brevi
where only singular and plural are distinct, whereas masculine and feminine share the same form.
So the plural of “incoerente” is ”incoerenti” and it doesn't matter what gender is the name it refers to. On the contrary, “appropriato” belongs to the first class and “strategia” is feminine, so the concordance is
strategia appropriata
strategie appropriate
For the masculine, it would be like
comportamento appropriato
comportamenti appropriati