We propose an extension of the notion of a state on a logic to a pseud
oadditive state on a logic replacing the ordinary addition by a pseudo
addition. As a special class we underline the possibility states based
on the operation of supremum. For a Boolean algebra B and a logic L,
we study the extension of the pseudoadditive states on B and L to a ps
eudoadditive state on their Ptak sum B + L.