Simplification
Cutting steps, jargon and required inputs often beats persuasion by a wide margin.
Simplification means reducing what a person must read, decide or supply to complete a task. It is the intervention with the best record in field experiments, and it is consistently underrated relative to messaging. People do not fail to act because they lack motivation as often as teams assume; they fail because the task is harder than it looks.
How it shows up in software
Simplification is prefilled fields, single sign-on, address lookup, sensible defaults, error messages that say what to type, and onboarding that asks for nothing until it is needed. It usually loses internal arguments to new features because it does not look like progress on a roadmap.
Using it well
- Delete a required field before adding a persuasive sentence. Count fields on your highest value form and cut the ones you can infer or ask later.
- Prefill anything you already know, and show the user what you filled so they can correct it.
- Rewrite the three screens with the highest drop-off at a plain reading level and retest with people outside the team.
- Move the decision to where the information lives. Asking for a VAT number during signup is harder than asking on the first invoice.
Where it turns manipulative
- Simplifying away material terms is not simplification, it is omission. Price, renewal and data sharing survive every edit.
- One-click purchase and one-click consent use simplification to remove the deliberation the user needed. Ease is only a virtue where the person already wants the outcome.
- Hiding complexity the user must eventually handle, such as burying permissions in a see more link, moves the burden rather than removing it.
Where you have seen it
Stripe Checkout
Card entry with inline validation, autofill and one field for expiry and CVC, so the form matches the card in the user's hand.
GOV.UK service pages
One question per page in plain language, with a reading level target applied across the whole estate.
Rust compiler error messages
Errors point at the span, name the rule and often print the corrected line, so fixing does not require a search.
What the research says
- Bettinger, Long, Oreopoulos and Sanbonmatsu, 2012 (Quarterly Journal of Economics)Well evidenced
Prefilling and submitting the US student aid form on families' behalf raised submission and college enrolment. An information-only arm produced little change.
The comparison between the help arm and the information arm is what makes this decisive.
- Behavioural Insights Team, 2012 onward (EAST framework)Well evidenced
A large body of UK government trials found making it easy, including shortening letters and removing steps, consistently produced the biggest reliable gains among behavioural interventions.
Grey literature rather than peer review, and effect sizes are the small field-scale kind documented by DellaVigna and Linos.
- Oppenheimer, 2006 (Applied Cognitive Psychology)Mixed evidence
Needlessly complex language lowered readers' judgements of the author's intelligence, which undercuts the belief that formal wording signals competence.
A small student-sample study. Directionally useful, not a strong base for large claims.
Grades are a judgement about the evidence, not about how useful the idea is. Plenty of contested effects are still worth knowing, as long as you do not cite them as settled.