Erin, a head-start preschool teacher, attempts to teach communication skills to her students by manipulating the environment. she evokes tacts and mands by placing items within the children’s sight, but out of reach. this process can be referred to

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; participant observation method;

answer; formal diagnosis (vera wand formal dress);

answer; develops policy;