The second step in a self modification program is to:

A self-modification program typically begins with identifying and specifying the target behavior. However, the question asks for the second step. After clearly defining the behavior, the crucial next action is to gather baseline data. This involves systematically observing and recording the frequency, duration, or intensity of the target behavior before any intervention begins. This baseline data provides a critical benchmark against which the effectiveness of the subsequent intervention can be objectively measured. Without this initial data, it's impossible to determine if the self-modification program is actually working or if changes are merely coincidental. Designing your program comes after understanding the baseline, as the design strategy depends on the initial data. Setting up a behavioral contract is a specific technique that might be part of the program design, not the second universal step.