Changeability & Optionality

Software's capacity to absorb future change — the second axis of value that AI-generated code systematically underdelivers on.

Also known as: endringsdyktig, futures / flexibility / optionality, optionality, flexibility, sustainable software (Charity Majors), sustainable software, anticipation, scaling design, dimensions of change

How authors use it

Oldest first (extraction date when no publication date is known).

AuthorTheir termTheir meaning
5) Vidar Moe: Det eneste Vidar vil er å ha det lett
Truls Jørgensen og Audun Fauchald Strand — Heis Podcast · 2025-11-17
endringsdyktig (carried over from his essay)Carried over from his 'KI, utvikling og følelser' essay — change-capable code as the engineering goal. Not used verbatim in this episode but implied throughout: the framework team and tooling stance exist precisely so that the code (and the organisation) remain endringsdyktig.
11) AI-spesial med Vilde Opsal og Anders Sveen
Truls Jørgensen og Audun Fauchald Strand — Heis Podcast · 2026-02-16
sustainable software (Charity Majors)Anders borrows Charity Majors' top-of-pyramid category for software that has to live a long time and absorb changes — the regime where AI's speed gains do *not* dominate the work
The keyboard was never the bottleneck
Mike Amundsen · 2026-04-16
anticipationThe design skill of building systems that support a range of possible futures, including unanticipated ones
The keyboard was never the bottleneck
Mike Amundsen · 2026-04-16
scaling designMaking design itself — not just runtime behavior — able to absorb change, support extension, and remain coherent across teams over time
Genie Tarpit
Kent Beck from Software Design: Tidy First? · 2026-04-29
futures / flexibility / optionalityThe ability to make future changes that work as expected without breaking existing behavior — the second axis of software value
Applying Best Simple System for Now for Software Design
Ben Linders · 2026-05-09
dimensions of changeThe multiple, unpredictable directions in which a product could evolve at any time; anticipating one dimension introduces speculative complexity that trades off against all the others
KI, utvikling og følelser
Vidar Moe · 2026-05-21
endringsdyktigChange-capable, malleable to change — a quality of code (and people/organizations) that Moe treats as the real engineering goal. The danger of accepting agent code uncritically is producing code that is not endringsdyktig.
Your Company Needs an Energy Strategy for AI's Next Phase
Eric Yanfei Zhao · 2026-06
Optionality (vs. ownership)Contractual rights to power (PPAs, VPPAs, green tariffs, colocation reservations) that secure access without the firm having to own generation assets.

Documents (21)

Propositions touching this concept (7)

By publication month, oldest first (extraction month when no publication date is known).

2018-06

2026-02

2026-04

2026-05

2026-07

Tensions

Is code a durable artifact humans must keep reading, or an ephemeral byproduct regenerated from a spec?
from: What did the participants of the Thoughtworks 'Future of Software Engineering' Europe retreat (mid-2026) conclude about how agentic AI is reshaping software engineering?
Assessment: The retreat's own 'largest divide' (Ördög). It is unresolved inside the room and inside the individual essays: Herlein concedes the deterministic 'code is the better spec' counter is 'hard to wave off', and Ördög reports being ironically pulled toward the dark-factory camp by her own good-code practices. The crux is whether a fuzzy prose spec can ever be the durable source of truth when the stated quality bar is verifiability — a tension none of them resolves.
How much of the build pipeline should run with no human reading the code (the 'dark factory')?
from: What did the participants of the Thoughtworks 'Future of Software Engineering' Europe retreat (mid-2026) conclude about how agentic AI is reshaping software engineering?
Assessment: Not simple optimism vs pessimism but a disagreement about preconditions and hidden costs. Ocytko's is a projection of where tooling is heading; Bangser and Verraes both supply reasons the projection is unsafe by default — learning-loss and missing prerequisites. Bangser has the stronger argument that the loss is structural (you cannot buy back organisational learning), which even an improving platform does not address.
Reversibility as a hedge vs a one-way commitment to deeper autonomy.
from: What did the participants of the Thoughtworks 'Future of Software Engineering' Europe retreat (mid-2026) conclude about how agentic AI is reshaping software engineering?
Assessment: Incompatible risk models. Verraes treats deep AI-dependence as the danger to insure against; Herlein treats not-committing as the existential danger. They cannot both be the rational strategy: reversibility trades some upside for exit options, while flywheel-commitment trades exit options for compounding lead. The tie-breaker is empirical (will access/economics deteriorate?) and neither has evidence — Fowler's 'tokenpocalypse' data leans slightly toward Verraes.
Does low-level code quality matter intrinsically, or only instrumentally (via token economics)?
from: What did the participants of the Thoughtworks 'Future of Software Engineering' Europe retreat (mid-2026) conclude about how agentic AI is reshaping software engineering?
Assessment: The disagreement is about the grounds of the fundamentals-revival, not just its truth. If quality matters only via token cost (Verraes, and Fowler's proxy), the case for it is contingent on token economics and evaporates if tokens get cheap; if it is intrinsic (Ördög), it survives cheaper tokens. This makes the popular slogan 'quality still matters' quietly unstable — the same conclusion rests on incompatible foundations.
Will the classic fundamentals (especially DDD / domain modelling) actually deliver this time — is the revival evidenced or merely asserted?
from: What did the participants of the Thoughtworks 'Future of Software Engineering' Europe retreat (mid-2026) conclude about how agentic AI is reshaping software engineering?
Assessment: The single slogan 'fundamentals matter more' spans concrete evidence (Verraes), unargued assertion with admitted bias (Nilsson), and active skepticism (Edwards-Alexander) — from attendees of one retreat. This directly exposes the 'the fundamentals are agreed' assumption below: the cohort's flagship convergence is doing a lot of work with very uneven support underneath it.
Can harness engineering actually solve the AI code quality problem?
from: What is the right approach to building harnesses around AI coding agents, and where are the limits?
Assessment: This is the central divergence in the literature. Osmani is most optimistic, operating from benchmark evidence that harness changes produce dramatic improvements on coding tasks. Böckeler occupies the middle ground, distinguishing solvable from unsolved harness domains. Beck is most skeptical, questioning whether harnesses address the root cause at all. The disagreement is partly empirical (what do the benchmarks actually measure?) and partly about scope (Osmani focuses on task completion; Beck focuses on long-term code value including flexibility). They may not be contradicting each other so much as talking about different time horizons: harnesses help with immediate task success, but the tarpit emerges over accumulated changes.
Will better models make current harness practices obsolete?
from: What is the right approach to building harnesses around AI coding agents, and where are the limits?
Assessment: Osmani makes the strongest case for permanence with concrete evidence of scaffolding migration. Beck keeps the door open for the Bitter Lesson hypothesis. The truth likely depends on the type of harness: mechanical safeguards (sandboxes, permission controls) may always be needed, while knowledge-transfer patterns (AGENTS.md, priming docs) may become less necessary as models improve at in-context learning.
Is code a durable artifact to be maintained, or an ephemeral byproduct regenerated from a more durable source (spec/objective)?
from: What is the future of software development in the agentic/AI age?
Assessment: The most-cited open question of the corpus, and genuinely unresolved (Herlein: 'no consensus here. None.'). The 'code is the better spec' counter is strong — code is unambiguous, executable, deterministic, whereas a prose spec is reinterpreted each run, which sits in tension with verifiability being the quality bar. Ruby's move is the most defensible: it dissolves the code-vs-spec fight by locating durability in the evaluation rather than any representation. Verraes and Ördög expose the load-bearing empirical unknown — nobody has data on regenerate-vs-patch cost or on long-term evolvability of agent-maintained code.
How far should software be automated — toward the fully-autonomous dark/software factory, or held back to bounded autonomy with humans in the loop?
from: What is the future of software development in the agentic/AI age?
Assessment: The spectrum runs from Ördög/Ocytko (full automation is arriving and desirable) to Bangser/Ruby/Verraes (deliberately withhold the last step). The decelerationists have the better of the safety argument today — Ruby's 'nobody will cede the blast radius' and Bangser's 'removing humans removes learning' identify concrete, unmet prerequisites — but Ördög's context-dependence (backends, COBOL) shows the boundary is domain-specific, not absolute. The real disagreement is less about capability than about who absorbs the blast radius when an autonomous fix goes wrong.
Strategically, is the right move to accelerate adoption to build a permanent lead, or to decelerate and hedge against AI's risks?
from: What is the future of software development in the agentic/AI age?
Assessment: Nearly opposite bets: Herlein optimizes for a world where AI keeps getting cheaper and better and first-movers win permanently; Verraes and Fowler optimize for a world where AI gets costlier, curtailed, or unreliable. Herlein's 'permanent moat' rests on flywheel logic plus a single secondhand anecdote and ignores technology-diffusion catch-up dynamics; Verraes and Fowler's hedge is cheap insurance but under-examines whether reversion is actually achievable once specs, agents, and toolchains are deeply embedded and human familiarity has eroded. The disagreement is ultimately a bet on the trajectory of token economics, which nobody in the corpus can price.

Open gaps (45)