How to Write Specification for a Mobile App Development Project?

How to Write Specification for a Mobile App Development Project?

How to Write Spec for a Mobile App Development


Each mobile application development starts with a concept. But how can you be sure that the concept is aligning with the needs of users, helping them to solve their real issues?

Moreover, an implementation of the concept should meet the needs of the business it’s gonna build up, otherwise, it may provoke project failure or heavy financial losses. According to PMI’s Pulse of the Profession in-depth report, about 47% of all unsuccessful projects failed to meet goals due to poor requirements management.

…about 47% of all unsuccessful projects failed to meet goals due to poor requirements management.

For every mobile app development company, the best way to overcome these issues is to develop a good specification for mobile. It helps to get the following points covered:

  • To be on the same page here;
  • To negotiate changes easily;
  • To be sure that the requirements are relevant to the business goals;
  • And get rid of doubts that something essential was missed.

Why Is It So Critical to Write a Good App Spec for Your Project?

The project management triangle model shows dependencies between the different project constraints – cost, scope, time and quality. This model also states that PM is able to trade between these features.

These parameters are impossible to control given your mobile app comes with no specs. For example, a customer wants to add some new features somewhen in the middle of the development process. As a result, the scope increases but PM has no evidence that the requirements weren’t previously included. So the only two ways for a manager to keep the cost stable is to either reduce quality or to increase the timescale. Sad but true.

One more reason to write mobile app requirements is that it is the most efficient way to coordinate the scope in writing. It is rather helpful for both you and your mobile app development partner.


What are the Specifications for Mobile Development?

The mobile app development requirements sheet document is made up of far more than just requirements. One of the best practices is a Software Requirements Specification created by Karl Wiegers. Below you can find out what’s typically in the document named SRS. Keep in mind that names, contents, and order may be substantially different, it’s up to an author.


1. Introduction


Purpose – identify the purpose of the document in a few sentences.

Document conventions – terms and definitions in the document.

Intended audience – descriptions of the different types of readers the document is intended for.

Project scope – a short description of the software features related to business needs.

References – all the external links required.

2. Overall Description

Product perspective – the description of the context and origin of the product prepared in a special form.

Product features – all the features that will be implemented in the app in a short table view.

Users roles and rights – the description of the user classes in a short table view.

Operating environment – hardware and software platforms, other products that must be taken into account.

Design and implementation constraints – everything that marginalizes the thinking-outside-the-box of developers and designers.

User documents – a list of user-related documents that will be released along with the app.

Assumptions and dependencies – here you can place everything that is unclear to classify at the current stage.

3. System Features


Here are all the functional requirements in the form of the major services provided by the app. For each one it should contain:


  • Description and priority – a detailed description and purpose.
  • Stimulus/Response sequences – a trigger that launches the feature.
  • Functional requirements (Use Cases, User Stories) – a scenario user interacts with the feature, from the beginning till the end, including alternate scenarios and exceptions.

4. External Interfaces 


Here is a place for any interfaces involved in the project.


  • User interfaces – prototype and description of all the app screens and display sections. Screens (tabs) should be presented separately, with images, presentations, and all other visual materials available.

  • Hardware interfaces – logical and physical characteristics of the interfaces between the app and hardware. Device models, physical controls usage, communication protocols engaged.

  • Software interfaces – APIs, cross-platform compatibility and operation systems, databases, third-party software tools, and integrated components. Clarify if your mobile app should be integrated with social media.

    Here is the option of setting up your mobile app to send any data from/to an external server and providing some general description of the server part. Other tunable parameters include printing availability, in-app purchases availability, geo-data functionality support and push notifications.

  • Communications interfaces – e-mail, browsers, server exchange protocols, message formatting definition.

5. Concerns / Queries / Doubts if any:

  • Performance – measurable parameters relating to the speed of work, productivity, etc.
  • Safety – any cautions that must be taken into account to avoid possible injury.
  • Security – all the required standards and arrangement must be implemented to dodge data breaches.
  • Software quality attributes – anything related to the quality measures of your app.


6. Other Requirements 

Any other requirements that aren’t placed elsewhere.

  • Appendix A: Glossary

Contains links to the definitions without which make it easy to interpret the SRS correctly.

  • Appendix B: Analysis Models

Place here diagrams and other visual modeling results. The DFD is necessary.

  • Appendix C: Issues List

A placement for everything that is unfinished yet. Use the TBD (To Be Determined) note for such cases.


Should My Mobile App Requirements Be Such a Bulky?

There is no need to copy the provided structure in full. If a project is simple enough, it’ll be better to exclude all unnecessary parts. The most essential rule is to cover as many requirements as possible.

Keep in mind that elective requirement in the specifications for mobile is much better than missed but necessary one. Of course, it doesn’t mean adding new useless features.

As we said before, there are three major categories of stakeholders, each with its own layer of requirements: business requirements at the top, user requirements in the middle, and technical requirements at the bottom.

All the three types of requirements must be traceable in between.

How to Approach the Writing?

Although writing specifications is quite big and time-taking, this is no big deal. If you understand what an app should look like, all you need is just flowing from simple to complicated.


Describe your idea


Say a few words about its main features, specify, for whom the app is intended. Don’t forget to add as much context details as you can, e.g. say something about its closest competitors or about an unoccupied niche. Then conduct a kind of research to specify the most relevant technologies and tools to implement your idea. Now you have a ready-made text for a Product perspective section.


Determine basic navigation patterns.


Use your imagination to come up with all possible actions users will take while using the app. Point out everything that users do, as well as each and every answer the system gives you out. Then analyze the actions to find out which ones were missing, and write them down too. Once the list of actions is full, analyze each action and search for alternative scenarios and possible exceptions. Usually, scenarios are pretty similar to ping-pong: actions of the user and the system constantly interleave each other.


Pick up market information.


The requirements specification document isn’t really a place where in-depth marketing research should be placed.

All you need is dig into your main competitors – platforms where they are presented (iOS, Android or both), roughly estimated popularity, etc.

Add some details of your targeted audience – whether they prefer iOS or Android phones, which sex is prevailing, what’s an average age, income level or geography?


Choose what features an application should have.


Return to your feature list to validate and prioritize all of them. Maybe some features look redundant while others might be shorter? Use a simple analysis method called “MoSCoW”.

It means that all the features can be divided into four groups – must, should, could and won’t (I hope you don’t need a further explanation). Update the features: there must remain only those that correlate with your business goals.


Prepare functional specification


For most people, this section looks much more complex than all the previous ones. At a first glance it is, but it’s really not. We’ll walk you through. For starters, use your validated scenarios to make a table with the users’ roles. Then create a table with your product features. After that, it’ll be quite easy to finish the System features section.


There are many other tables to go, but all of them are way too short. Moreover, after a little review, you should learn two things. The first one is that you don’t need half of non-functional requirements. The second one is that you can find all the data for the rest of the tables, using Google search. Way to go!


Provide wireframes to complement the text.

The last stage is the most time-consuming. You don’t need to draw every last screen of your app, but all the features described before must be covered by the wireframes.

What Tools and Techniques to Use for the Wireframing?

Use one of the tools which make the prototyping process quite easy and relatively fast – AxureRP (Windows, Mac), Balsamiq (Windows, Mac, web, Google Drive), Figma (Windows, Mac, Linux), Sketch (Mac) and others. Also, you can use oldy-moldy Photoshop or one of the online visual layout tools, e.g. Webflow.


Common rules of UI design are pretty simple.


  • Place the elements from up to down and from left to right.
  • Use the elements relevant to the situation and certain display section UI only.
  • Make the textual content in every field as long as possible to assure that your interface can hold it.
  • Do not place the elements too close to each other.
  • Check for iOS and Android actual guidelines before the start.



Developing the mobile app without specs is risky and dangerous. Also, the Software Specification requires some investments in the initial stage but helps avoid a greater spending in the later stages of the project.

If a potential mobile app development partner proposes you to start the development process without the abovementioned, there is a good chance of dealing with newbies in the wild, so you’d rather look for someone more skillful and experienced like Apro Software for instance.

Once you have finished reading the article it’s time to chat! We’d love to hear what you are working on and ready to help in the field of our competency. Drop us a note here and we’ll get back to you within 24 hours!



5 Things You Need to Keep In Mind When Developing a Mobile App

5 Things You Need to Keep In Mind When Developing a Mobile App


With the ever increasing demand for applications, the market cannot keep up with the number of application downloads. By developing both a standard, as well as unique application to be used on smart phones, you will be able to provide a well-developed and appealing product to customers. 

1. Target market

Any smartphone app development company will always keep a target market in mind, even before they start any planning on programing or what platforms the application will be used on. It is an important aspect to consider, even before you start to develop you applications. Different aspects will appeals to different markets. A professional developed app which is elegant and simple will appeal to adults, while and entertaining, and empowering application is more appealing to teenagers. The market of applications focused on children is the fastest growing, and it has the largest appeal, especially for parents who what and simple, yet entertaining application to distract their children. Target audience is the first and most important aspect to keep in mind when developing a mobile application. 

2. Platform

Mobile app development is dependent on the platform it will be used on and different platforms use different programing. An important aspect to keep in mind is what device you are developing the applications for, as different smart phones required different programing. You should always aim to have you application as universal as possible to be able to appeal to a larger market, but focusing on a specific smart phone app will also create a more specific target market. It is important to understand that most mobile device has limited screen space and you must plan accordingly. In order to perform the best on a certain platform, the design needs to correspond with the mobile device being used. When developing applications, you would always keep specific platform aspect in mind to make sure that they function properly on the device you are targeting. 

3. Pricing

All app development companies know the importance of offering applications at a competitive price. This is to not only make sure that they make a profit from the development and sale of the applications, but also that the price they are offering is competitive and will attract customers to their store and get them to buy the applications that they are offering. Many stores will offer some of their small or less popular applications for free, but this is to attract customer in order for them to buy other more professional and popular apps. If you are new at app development, then offering yours at a low price is a good idea, but it still needs to be a fair amount to make sure that you make a good profit, and also to make sure that customer will see the application as well-developed and professions. Often good applications that are offered at a low price are avoided. It is good to do some market research before settling on a price. 

4. Design

In mobile app development, the design is the aspect that truly sells the applications. The development of the design will be depended on the target market that you are focusing on, the platform you want to develop the application for, as well as the amount of money you want to charge for its download. Even an application that is available for free must be well-designed. It is important to always create a design that will work well on the mobile device, while keeping it as simply as possible. Simple, appealing designs will make sure that the application not only works well on the platform it is used on, but also makes it user-friendly. Easy navigation in the form of lists and icons must always be included, as well as simple font and no excessive writing. It should not contain many images, and must not exceed an average of about 100 kilobytes. 

5. Marketing

The only way people will know about your application and want to download it, is if you market it. App development companies take advantage of social networking sites to create customer interest. Twitter, Facebook and other sites have become a key aspect in advertising the applications you have available, and will create an easy to use platform to market you app to a worldwide audience. Marketing is just as important to keep in mind when you develop a mobile application.

Important aspects

Each of the five different aspects that you should keep in mind when developing a mobile app are important. You cannot exclude any of them.

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