All of the following are reasons to perform a strand test EXCEPT:

Performing a strand test is primarily intended to evaluate various aspects of hair when preparing for chemical services such as coloring or perming. The main reasons include assessing hair strength, checking for the desired color changes, and determining the appropriate processing time for the chemicals being used. Each of these factors is crucial in ensuring that the results are satisfactory and that the hair remains healthy and undamaged.

Determining the best type of shampoo is not typically a reason for conducting a strand test. Shampoo selection usually occurs prior to any chemical processes based on the hair's condition, type, and needs rather than through a strand test, which focuses more on the effects of the chemical treatments on the hair itself. Therefore, the accurate identification of appropriate products like shampoo would be based on prior knowledge of hair care rather than the outcomes from a strand test.