(B) First trial.
Problem: Unprepared home work.
| Antecedents | Consequents | |
| 1. Length of lesson, |  | Work not properly prepared. |
| 2. Definiteness of lesson, | ||
| 3. Amount of interest shown, | ||
| 4. Physical condition the same. |
Second trial.
| 1. Length of lesson the same, | | Work properly prepared. |
| 2. Lesson made more definite, | ||
| 3. Interest the same, | ||
| 4. Physical condition the same. |
The foregoing symbolized:
L D I C W
L – I C —
It is seen that indefiniteness of lesson assignment is the cause of the unprepared home work.
(4) Advantages and disadvantages of the Method of Difference.