For forecasting relies on the assumption that underlying relationships in the past will continue into the future, resulting in its simplicity as a method but inaccuracy in times of change.

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; caravan;

answer; to be the responsible party for healthcare delivery through medicare and medicaid programs;

answer; dr.black,who allows only certain individuals to mate;