An incident symptom may indicate a future, past, or current event; an indication signifies that an incident may have occurred or be occurring now, and is a sign that an incident may occur in the future.

its d i know cause i've been googling it

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.