How do I work out what I actually need before I start looking?
Requirements written after browsing are descriptions of what you saw. How to derive them from how you will actually use the thing, and how to tell a must from a want.
- Difficulty
- beginner
- Time
- 20 min
- Read
- 3 min
Short answer
Describe the use, not the product. Write down who will use it, how often, where, for how long, and what has gone wrong with the last one. Turn each of those into a requirement. Only then look at what is available. Anything you add to the list after you start browsing needs to justify itself, because it probably came from an advert.
The single largest source of buyer's regret is not paying too much — it is buying something specified against the wrong requirements, which is what happens when the requirements are written by the market rather than by you. Ten minutes spent describing your actual use, before you have seen a single product page, changes what you end up with more than hours of comparison afterwards.
Step by step
- Describe the use in plain sentences.Who uses it, how often, in what space, in what conditions, and for how long you expect to keep it. "Two people, three times a week, in an unheated garage, for about ten years" specifies a very different product from "daily, indoors, replaced every three years".
- List what went wrong with the one you have.This is the richest source of real criteria there is. Too loud, too heavy to lift, the cable was too short, it did not fit in the cupboard, the filter was impossible to get to. Each complaint is a requirement.
- Measure the constraints before anything else.Space, weight, access, power supply, existing connections, the width of the doorway it has to come through. Physical constraints are absolute musts, and they eliminate options faster than anything else on the list.
- Separate must from nice.Ask of each item: if the option failed this, would I still buy it? If yes, it is a nice-to-have. Most lists shrink to two or three genuine musts under this test, which is exactly what you want.
- Add the ones people forget.Servicing and spares availability, how long the manufacturer supports it, noise, how it is cleaned, what it costs to run, what happens when it breaks, and what it is worth second-hand. These decide satisfaction years later and never appear on a spec sheet.
- Only now, go and look.Take the list with you. If something on the list turns out to be impossible at your budget, change the list deliberately and write down that you did, rather than letting it evaporate.
Tips
- Ask someone who owns one what they would change. Owner regret is more informative than owner satisfaction.
- Watch out for requirements borrowed from someone whose situation is not yours — a friend's ideal machine is specified against their household, not yours.
- If you are replacing something that lasted well, write down what was good about it too. Continuity is a legitimate criterion.
Common mistakes
- Starting from a product category rather than a job — It hides alternatives. "I need a tumble dryer" forecloses on a heated airer, a better spin speed or more drying space, any of which might solve the actual problem more cheaply.
- Specifying for the extreme case — Buying for the once-a-year use makes you live with the wrong thing the other fifty-one weeks. Specify for the normal case and find a separate answer for the exception — borrowing or hiring is often it.
Questions people ask
How long should this take?
Fifteen to twenty minutes for a household purchase. Longer for something you will keep a decade, but it is a short exercise by design — the value is in doing it at all, not in doing it exhaustively.
What if I genuinely do not know what I need?
Then the first thing to find out is how you will use it, not which model is best. Borrow, hire or try one for a week and the criteria write themselves.