Like other definitions of theories, including Popper's, Kitcher makes it clear that a theory must include statements that have observational consequences.
Sund iyad iliɣitan ən təmusnawen, dǎɣ taha tan Popper, Kitəher sidututnat as təmusne anihaga atagu isalan wi igrawnen awa atiwaɣšadan itawǎnhayan.