A psychologist is interested to know which of two sorting techniques leads to better memory performance in 6-year-olds. Each participant first sorts a set of pictures any way he or she likes. The recall is then tested. After this, each participant is required to sort an equivalent set of pictures into five predetermined categories. Recall for the items in this step is then tested. What procedure does this study represent

Repeated measures design

Explanation:

Repeated measures design is categorized as a design used in researches. Same variable is measured multiple times with the matching subjects. Variations in conditions are allowed that are recorded for two or more than two times. Measurements are taken on repeated terms. These variations in measurements helps in analyzing the results and applying the in the applications.  

In the given excerpt, the procedure of repeated measures design has been represented. Every participant's sorting technique and memory is tested.

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.