To minimize the extent to which outcome differences between experimental and control groups result from expectancy effects, researchers make use of:

step 1. boil eggs

step 2.eat eggs

step 3. get your hot poonts ready

is there multiple choice or do you need like an essay answer?

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.