You do not need a technical document to get a useful app. The best way to start is to describe a real day of work in plain words. Here is what actually helps us build the right thing.
Start with the job, not the screens
It is tempting to jump straight to “I need a form here and a button there.” But screens are the last thing to decide, not the first. When you start with the screens, it is easy to build something that looks right but misses the point.
Instead, tell us the job. What starts the work? Who does it? What has to be true before it is finished? When we understand the job, the screens almost design themselves.
Name the people involved
Most tasks pass through more than one pair of hands. A request comes in, someone checks it, someone approves it, and someone else acts on it. Each person needs different things.
List the people who touch the work and what each one needs to do their part. This tells us who should see what, and where one person hands off to the next.
Bring a real example
One real example is worth more than a page of description. A real invoice, a real form, a real email thread — these show us the messy details that matter.
Examples also show us the exceptions. The odd case, the missing field, the customer who never fills things in correctly. Those exceptions are usually where the value is.
Say what must never go wrong
Every job has a few things that must never happen. A payment sent twice. A private file shown to the wrong person. A record saved without a required check.
Tell us these up front. They become the rules the app protects, and the things a reviewer looks for before anything goes live.
A simple checklist
If you can answer these five questions, you have a strong start:
- What starts the task, and what does a good finish look like?
- Who is involved, and what does each person do?
- What information does the work depend on?
- What must never go wrong?
- Can you share one real example from start to finish?