Amajor difference between the psychoanalytic stage theories (freud and erikson) and the more cognitive or experimental stage theories (piaget and kohlberg) is

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answer; ///population;

answer; under developed;