|•||External Generalization Challenges|
|•||Generalizing from Single Studies|
|•||Part VI: Suggested Reading|
A training manager in an investment firm hypothesizes that knowledge about investment derivatives will help a firm's investment counselors recommend more profitable investment choices to clients. (An investment derivative is a security whose value depends on the price of some other security. A stock option is an example; the value of the option depends on the price of the stock.) A training program is developed, and a sample of investment counselors is trained. Client investment performance is then compared between the trained counselors and a sample of untrained counselors over a 12-month period following the training. As expected, the manager finds that clients of the trained counselors obtain a higher investment return.