Cross-platform app: how to prepare your project step by step

Your team checks information from a mobile phone, while administration needs to work from a computer. Or perhaps your customers expect to complete a task from their phone, but the internal process relies on several disconnected tools. At that point, a reasonable question arises: do you need a cross-platform app or a simpler solution?

A cross-platform app may be suitable when the same service needs to work across several operating systems or devices, while maintaining a consistent experience and business rules. However, that label alone does not determine the project. By the end of this guide, you will be able to define what the application needs to solve, what to include in an initial version and which questions to clarify before choosing the technical solution.

Expected outcome

The outcome should not be simply “having an app”, but having a clear proposal that answers these questions:

• What specific problem it needs to solve for your business, team or customers.
• Who will use it and from which devices.
• What actions it must allow in an initial version.
• What data, tools and people are involved.
• How you will verify that it works before expanding it.

With this foundation, you can assess whether a cross-platform app, a browser-based web application or a different solution is the right choice. Technology comes afterwards: first, you need to define the work it must perform.

Step 1: define the objective

Objective: state the change you expect to achieve through an observable action.

Action: describe the current situation and the action that should become clearer, faster or easier to control. Avoid broad objectives such as “modernising the business” or “improving management” if you cannot translate them into a specific use case.

For example, in a hypothetical scenario, a maintenance company may need technical staff to view a work order, record the work completed and attach information from a mobile device. The objective would not be to create a mobile application in itself, but to ensure those tasks are recorded at the time and made available to the person reviewing them.

It is also useful to separate user groups. A customer, an administrator and a technician may need different journeys, permissions and information even when they access the same system.

Check: complete this sentence without using technical terms: “The application will allow [user type] to [action] so that [operational outcome].” If the sentence remains ambiguous, the objective still needs to be defined more precisely.

Step 2: define the scope of the initial version

Objective: decide what needs to be ready at the beginning and what can wait.

Action: gather the functions you have in mind and classify them by priority:

• Essential: without them, the initial objective cannot be met.
• Desirable: they add value, but their absence does not prevent the main use.
• Future: they are retained as potential improvements without being treated as included.
• Out of scope: they do not belong to this project.

Naming a feature is not enough. Define what it does and under which conditions. “Order management”, for example, may mean viewing orders, creating a new one, changing statuses, cancelling, assigning people responsible or sending notifications. Each possibility involves different rules and screens.

Include in this review items that are often left until the end: user access, roles and permissions, notifications, offline work where necessary, an administration panel, languages, initial data loading, training and ongoing maintenance.

Check: every essential function should have a user, an action and an expected outcome. If you cannot explain what happens when it is not available, you probably do not yet know whether it should form part of the initial version.

Step 3: identify data, owners and dependencies

Objective: avoid designing the application without knowing where it obtains information from or who makes decisions.

Action: map the basic data flow. Identify what is consulted, who can create or modify information, and which other tools are involved. If the application needs to connect to an invoicing program, an inventory system or an existing database, clarify what information is exchanged and what should happen if that connection fails.

Also assign owners for these tasks:

• Setting priorities and approving changes.
• Providing and reviewing content, text or documents.
• Providing the access required for external services.
• Reviewing tests before the solution is put into use.
• Maintaining data, users and content after delivery.

A cross-platform app does not remove the need for these decisions. Sharing part of the logic between platforms may simplify the development of certain projects, but business rules, data and real-world use cases still need to be defined.

Check: for each relevant data item, you can identify who enters it, who views it, who can change it and what its source is. If an answer depends on an external tool, make that dependency visible before finalising the scope.

Step 4: choose the solution after understanding the use case

Objective: select a technical option that fits the problem, rather than choosing a label too early.

Action: compare alternatives based on the intended use. A cross-platform app often makes sense when you need to provide the same service across different devices and mobile access is relevant to the task. However, not every process requires installation from an app store or specific device capabilities.

Consider these questions before deciding:

• Will users work mainly from a mobile device, a computer or both?
• Do they need to use the camera, location, notifications or other device functions?
• Is access required when the connection is unstable or unavailable?
• Does the service need to be public for customers, internal for the team or both?
• What real differences will there be between the experience on each device?
• Who will maintain the application and the associated accounts afterwards?

A web application may be a good fit if work is carried out mainly in a browser and does not require certain phone capabilities. A mobile-specific application may be justified when the experience, context of use or device functions require it. The decision needs technical validation once the requirements, integrations and project constraints are known.

Check: you should be able to explain why each platform is necessary for the end user. “Because we want to be everywhere” is not a sufficient criterion; “because the team performs this task on a mobile device and administration reviews it from a computer” does provide a basis for analysis.

Step 5: validate the workflow before expanding functionality

Objective: verify that important tasks are understood and completed as expected.

Action: turn each priority function into a specific test. Describe the initial situation, what the person does and the outcome they should see. Add what should happen in foreseeable error cases, such as incomplete data, missing permissions or an unavailable connection.

Following the hypothetical example of the technical team, one criterion could be: an authorised person opens an assigned work order, records the task completed and saves the report; afterwards, the person responsible can view that report from their management area. If a required field is missing, the application must indicate this before completing the record.

Validation is not only about checking that a screen loads. Review the real journeys for each profile, permissions, displayed data and situations where something does not go as planned. The people who will carry out the work every day need to take part in this review, because they can identify friction points that do not appear in a general description.

Check: every essential function has an acceptance criterion that someone can review without interpretation: who performs which action, in what context and what outcome they must obtain.

Execution mistakes to avoid

The usual problem is not choosing the wrong technology because you do not know its name, but finalising important decisions too early. Pay attention to these risks:

• Confusing the channel with the objective. Requesting a mobile app does not explain which task needs to be solved or for whom.
• Turning every idea into an initial feature. An overloaded first version makes it difficult to prioritise and validate the main use.
• Defining integrations by name only. Specify which data travels, in which direction and what happens in the event of failure.
• Forgetting permissions. If different profiles see or modify different information, that rule must be defined from the beginning.
• Not assigning owners. Content, approvals and access to external tools require a responsible person.
• Assuming mobile and computer work in the same way. The objective may be shared, but the context of use and interface may require specific decisions.
• Leaving validation until the end. Acceptance criteria help identify misunderstandings before a feature is considered complete.

A cross-platform app makes sense when it addresses a clear need on more than one device and its scope can be kept under control. If you have already identified the objective, users and dependencies but still have doubts about the most suitable solution, you can tell AVSISTEC about your application project to assess the technical and functional fit before committing to development.