In the 38th chapter, Thinking about life, Kahneman assesses the overall quality of life relative to specific factors. In the case of marriage, this is expected to make people happier, yet their life satisfaction decreases in the years after the marriage, comparative to the actual year of marriage. This reveals the initial expectation at the level of the first system of thought, and the reality assessed at the second level of thought.

In the concluding chapter, author Daniel Kahneman (2012) reviews his insertions of the two thinking systems within the psychological field; he also addressed and reviews the concepts of the two selves and the econs and humans. The process of thought is ultimately understood as a complex combination and interaction of the two systems of thought, interaction which can sometimes be uneasy, and even conflicting.

Finally, the last two chapters of Thinking, fast and slow are presented in annex forms and they deal with additional components of the though process. In Judgment under uncertainty: heuristic biases, emphasis is placed on the element of insecurity in the process of decision making,...

In such a context, import roles would be played by both first as well as second systems.
In Choices, values and frames, the topic is quite similar, with the difference that uncertainty is replaced by risk. In other words, emphasis falls on decision making in the context of various risk degrees. In this scenario as well, individuals or parties involved in the decision making process make use of both systems of thought and the final decision depends on how the systems interact within each individual.