To write software requirements, or a software spec, as a business owner, you do not need technical words. You describe, in plain language, who will use the software, what job it should do, what it connects to, and what "done" looks like, and a good builder turns that into a written spec you can read and change before anything is built.
This guide shows how to describe what you need, what a finished spec looks like, and a simple template you can fill in on paper before your first conversation with any developer.
Why a written spec matters
A spec is the agreement between what you pictured and what gets built. Without one, the builder guesses. Guesses turn into rework, surprise costs and software that almost does what you wanted. A written spec gives the builder and your team one shared picture to check every feature against.
With one, everyone works toward the same finish line. You can read it, point at a line and say "no, that is not how we do it." The builder can check every feature against it. When the software is done, the spec is the yardstick you test it against.
On our builds, nothing is made until you have read and approved the spec. Our in-house pipeline checks every feature against it before you ever see the result. You can read how our engine works.
You already know what you need
Most owners worry they cannot describe software. They can. They just describe it in business words, and that is exactly right. A line like "my techs keep calling the office for the address" already names a problem, a person and a step that wastes time.
"I want to stop losing track of estimates" is a fine start. "My techs keep calling the office for the address" is a fine start. "I copy every website lead into my customer list by hand" is a fine start. Each one names a problem, a person and a step that wastes time.
Your job is to describe the work. The builder's job is to turn it into features. You never have to write code or a technical document.
How to write software requirements in plain words
To write software requirements in plain words, answer seven questions in order, covering the problem, the people, a normal day, the connections, the rules, what stays with a person and what done looks like. Short, honest answers beat long, polished ones, and you never need technical terms.
1. What problem are we solving?
One or two sentences about the leak. What goes wrong today, and what does it cost you in time or missed work? Example: estimates go out and nobody follows up, so jobs we could have won go to someone else.
2. Who will use it?
List the people, by role. The office manager, the techs in the field, the owner, the customer. For each one, say what they would do with it. Customers might only see a page. Techs might only need their phone.
3. Walk through a normal day
Describe how one job moves through your business today, step by step, from the first call to the paid invoice. Then mark the steps you want the software to take over or make easier. This walk-through is the most useful thing you can hand a builder, and our guide on how to write SOPs with AI shows a quick way to get those steps on paper.
4. What does it need to connect to?
Name the kinds of tools it should work with: your accounting software, your calendar, your texting tool, your email, your customer list. Say which way the information should flow. For example, a paid invoice in the accounting software should mark the job paid on the board. Our guide to connecting business software explains how that two-way sync works.
5. What are the rules?
Write down the rules your team follows without thinking. Who can see prices, which follows the security principle of least privilege (opens in a new tab) of giving each person only the access their job needs. Which jobs need the owner's approval. What counts as an emergency. When a customer gets a reminder. Rules are where most surprises hide.
6. What always stays with a person?
Name the decisions the software must never make on its own. Pricing exceptions, promises to customers, anything involving safety or money above a limit you set. Writing these down early keeps them safe.
7. What does done look like?
Finish with a plain test. "When a lead comes in from the website, it shows on the board within a minute and the office gets a text." If you can describe the test, the builder can prove it passes.
A simple spec template, in prose
A simple spec template fits on one page and covers the problem, the people, a normal job today, what changes, connections, rules, what stays human, what done means and ideas for later. Fill in each line in your own words, and keep the later ideas for a second build.
The problem: In one or two sentences, what goes wrong today.
The people: Each role that will use it, and what they do with it.
A normal job, today: The steps from first contact to paid, in order.
What changes: The steps the software should take over or make easier.
Connections: The tools it should work with, and which way information flows.
Rules: Approvals, permissions, timing, and what counts as urgent.
Stays human: Decisions the software must hand to a person.
Done means: Two or three plain tests that prove it works.
Nice to have later: Ideas that can wait for a second build.
That last line matters. Most good builds start small. A Tier 3 lead tracker with follow-up reminders can grow into a full system later, on the same foundation.
What happens after you describe it
We take your notes, ask follow-up questions, and write the formal spec. It lists every feature, the rules each one follows, what it connects to and the tests that prove it works, all in plain English. You then read and change it, and nothing is built until you approve it.
Then you read it and change it. Add what is missing. Strike what is wrong. Move ideas to "later." Only when you approve it does the build start. During the build, every feature is checked against the spec by separate reviewers and machine tests, and at the end you walk through the working software with your own examples. Practices like these, meant to lower the risk of security flaws, are what NIST's Secure Software Development Framework (opens in a new tab) sets out. Our plain-English tour of how we build software with AI shows each of those steps.
If you want to see what kinds of builds a spec can describe, browse the seven tiers on our Solutions page or read custom software for small business. Founders writing a spec for a new product can start with our guide to AI development for startups.
What stays with your people
A spec also protects your team. It writes down which decisions stay human, so the software supports your people instead of second-guessing them. Your office keeps the judgment calls. Your techs keep the work. The software takes the repeat steps. Same team. Same jobs. More capacity.
Frequently asked questions
Do I need to write the software spec myself?
No. You describe the problem and how work moves today, in your own words. We write the formal spec from that, and you read and change it before anything is built.
How long should a software spec be?
As long as it needs to be to remove guesswork. A small fix might fit on one page. A full platform might run many pages. What matters is that you can read every line and agree with it.
What if I change my mind after the spec is approved?
That happens. Small changes are folded in. Bigger ones go into the spec as a change you approve, so the builder and the checks are always working from the same page.
What is the difference between a spec and a quote?
A quote says what it costs. A spec says exactly what you get. A good builder gives you the spec first, so you know what the price is for.
Next step
If you have a problem you want software to solve but are not sure how to describe it, book a free workflow consult. We work with owners across the Kansas City metro and beyond. Bring rough notes. We will help you turn them into a plan.
About the ScaleAlphaAi team
We are a Kansas City company that designs and builds AI agents and custom software for small businesses, trades and growing firms. We write these guides from our work with owners and office teams: what AI handles well, what stays with your people, and how to start with one workflow.
Meet the team
