The MPrin of technical debt that’s incurred as a result of a change in standards or regulations, internal or external, is the cost of bringing all affected assets into full compliance. The conventional definition of the MPrin for this kind of technical debt includes only the cost of aligning the existing assets to the new standards or regs. Properly accounted for, however, the MPrin should include ripple effects, which are the changes in other assets that are required not directly by the change in standards or regs, but by the requirement that other assets maintain compatibility with the assets affected directly by the change in standards or regs.
The phrase standards or regs is beginning to bother even me. I’ll switch to standards with the understanding that I mean standards or regulations (or regs) except when I say so explicitly.
A view of the left side guard on a truck operated by the City of Cambridge, Massachusetts. Side guards prevent vulnerable road users (pedestrians, bicyclists, and motorcyclists) from being swept under trucks and crushed (and often killed) by the truck’s rear wheels. Cambridge has a pilot program affecting city-operated trucks, but Boston is requiring all contractors to install side guards. This change in regulations creates a technical debt for all truck operators whose vehicles lack side guards. [Volpe 2017] City of Cambridge photo courtesy U.S. Department of Transportation.
The activity required to align existing assets to the new standards can have expensive consequences, which must be included in the calculation of MPrin, but which, unfortunately, are often overlooked or accounted for in other ways. For example, the testing required by the standards alignment effort might require a service interruption or product availability delays or interruptions, which could entail a revenue stream delay or interruption. That lost revenue is certainly a consequence of the debt retirement effort.
Deferring retirement of this class of technical debt can expose the enterprise to the risk of MPrin growth in two ways. First, when we defer debt retirement, the number of instances of violations of the new standards can increase, of course, as new assets are developed in compliance with the obsolete standards. Second, and less obvious, perhaps, is the potential for increases in the number of ripple effect instances when we defer debt retirement. These instances arise from increases in the number of artifacts that require updating, not because they are not compliant with the new standards, but because they need to be made compatible with the components that are eventually modified to comply with the new standards. In this way, MPrin at debt retirement time can differ from — and greatly exceed — the savings realized when we first incurred the debt.
However, as with most technical debts, deferring retirement of this class of debt can sometimes be wise. For example, if the assets that bear the debt are about to be retired, the technical debt they carry vanishes when those assets are retired.
References
[Volpe 2017] Volpe National Transportation Systems Center. “Truck Side Guards Resource Page,” October 2017.
In some instances, technical debt is actually a missing or incompletely implemented capability. If we retire the debt by completing the implementation, the MPrin is the cost of that effort, plus any training, testing, and lost revenue. If we retire the debt by halting or withdrawing the capability, the MPrin is the total cost of removal, plus testing and lost revenue.
Platform component upgrades often trigger the need to make changes in whatever sits atop the platform, to maintain compatibility with the platform. Those changes obviously contribute to MPrin. But less obvious are the contributions that arise from deferring the upgrade.
The MPrin of an asset that is subjected to new development or enhancement has some special characteristics. For an existing asset, new development can lead to duplication of capability. For new assets, unanticipated opportunities can transform into technical debt components that were not viewed as technical debt, without ever changing them in any way.
Some examples might help to clarify the differences between the principal of financial debts and the Metaphorical Principal of a technical debt. The examples to come in the next four posts are designed to illustrate the unique properties of MPrins of technical debts.
Expect the unexpected with technical debt retirement efforts, because they can conflict with ongoing operations, maintenance of existing capabilities, development of new capabilities, cyberdefense, or other technical debt retirement efforts. Policymakers can make important contributions to the enterprise mission if they can devise guidelines and frameworks for resolving these conflicts as closely as possible to the technical level.
The principal amount of a financial debt and the metaphorical principal of a technical debt have very different properties. They are so different that it’s wise to avoid using the term “principal” to refer to the metaphorical principal of a technical debt. We use the term MPrin.
