In Chapter 8 of Nobody Designed This, we explore how Complexity is Created One Exception as a Time. Thischapter explains how individually defensible exceptions, accommodations and inherited variants combine into costs that no single decision owns. It introduces the Exception Accumulation Curve and the Exception Test, showing howcoupling shapes cost and how legitimate variety can be preserved without unmanaged complexity.

This chapter explores how organisational complexity arises from the accumulation of individually justified exceptions and deviations from standard designs. The author introduces the Exception Accumulation Curve to demonstrate how separate variations eventually interact, driving up systemic costs for coordination, data reconciliation, and future changes. While some variety is necessary for legal or operational reasons, unmanaged adaptations often create a long tail of hidden dependencies that no single person owns. To combat this, the text proposes an Exception Test and a modular architectural approach to ensure that legitimate differences are purposefully governed rather than left to accumulate as technical or administrative debt. Ultimately, the chapter argues that proactive portfolio governance is essential to prevent an organisation from drifting away from its intended design through thousands of minor, uncoordinated choices.

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