How to Write Your App Requirements and Define Your MVP Without Costly Mistakes
A clear requirements document saves time and money. Learn how to write one and how to choose the features for your first version.
One of the most common reasons projects run late and over budget is that the idea was clear in the owner's head but never written down. The fix is simple: write down what you want before the work starts.
What Is an MVP?
An MVP is the "minimum viable product": an app with only the core features that solve the user's main problem. Its purpose is to:
- Launch faster and for less.
- Test the idea with real users.
- Build the next phase on real data, not guesses.
Steps to Write Your Requirements
1. State the goal in one sentence
Example: "An app that lets patients book an appointment with a nearby doctor in under a minute." If you can't summarize the goal in one sentence, the idea needs more focus.
2. Define the users
Who will use the app? Usually there is more than one type: the customer, the system admin, maybe a service provider. Each has its own needs and screens.
3. Write the user journey
The user's steps from opening the app to reaching their goal. For a delivery app: sign in, choose a restaurant, add items, pay, track the order, rate.
4. Sort features into three groups
| Group | Meaning | Example |
|---|---|---|
| Must have | App doesn't work without it | Login, booking |
| Should have | Improves the experience | Notifications, advanced search |
| Nice to have | Can wait | Loyalty points, in-app chat |
An MVP includes the first group and only part of the second.
5. List the constraints
Budget, launch date, and required integrations such as a payment gateway or an existing system.
6. Add reference examples
Screenshots or links to apps you like, with what exactly you like about them. This saves hours of explanation.
Common Mistakes
- Putting everything in version one. More features means a later launch and a higher cost.
- Vague descriptions. "Payment system" is not enough. Cards, e-wallets, or cash on delivery?
- Forgetting the admin dashboard. You will need to manage orders and users in practice.
- Missing edge cases. What if the payment fails? What if the user forgets their password?
A Simple Template to Start With
- App name and its goal in one sentence.
- User types.
- Feature list sorted (must, should, nice to have).
- Platforms (Android, iOS).
- Required integrations.
- Similar apps you like.
- Budget and target date.
Even if your answers are incomplete, they are an excellent starting point we can build on together.
Not sure where to start?
Send us your idea as it is, and we'll help turn it into clear requirements and an MVP plan.
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