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Fixed vs. Agile Contracts: Which One Is Right for Your Custom Software Development Project?

kokou adzo



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Choosing the right contract type for your custom software development project is crucial. It can define the overall structure of the project, the roles, and responsibilities of each party, and ultimately determine its success or failure.

When considering software development contracts, the two most common models are Fixed Price and Agile contracts.

What Is a Fixed Software Development Contract?

A fixed contract, as the name suggests, is a contractual arrangement between the vendor and the client, where both parties agree on a specific sum of payment for the entire project.

This software development contract type is typically used for projects that have well-defined requirements, deliverables, and timelines. The vendor remains responsible for all aspects of the project delivery, including quality, timeliness, and costs.

Advantages Of Fixed Price Contracts


Fixed price contracts offer businesses an opportunity to have predictability in their budgetary planning. The clients know exactly what they will pay for, at what cost, and when it will be delivered.

Reduced Risk

By shifting the risk and responsibility to the vendor, clients reduce their risk exposure. They rely on the vendor’s expertise to fulfill the requirements and take responsibility for the project’s outcomes.

Clear Scope

Fixed price contracts emphasize clear scoping, documentation, and detailed specifications. Project requirements are defined upfront, so there is no ambiguity about what is expected.

Disadvantages Of Fixed Contracts In Software Development Solutions

Less Flexibility

Due to their rigid structure, fixed contracts lack flexibility. It becomes challenging to make changes to the contract once it is signed, which can lead to some disappointment in the end product.

Limited Room for Evolve

The very nature of the fixed scope and detailed specifications means that there is limited room for the project to evolve during development. Changes require significant amendments to the contract, which can result in cost overruns and timeline delays.

What Is Agile Contract In Custom Software Development?

Agile contracts are based on the principles of the Agile Manifesto, which emphasize flexibility, face-to-face communication, and iterative development. This contract type uses an incremental approach that works in short sprints.

Clients have more control and involvement in the project’s outcome, with a greater focus on collaboration and communication.

Advantages of Agile Contracts

High Flexibility

Agile contracts are versatile and offer flexibility. The Agile methodology is based on iterative, feedback-driven development, so changes are made throughout the project lifecycle.

Greater Collaboration

Agile contracts in software development solutions involve greater collaboration and input from clients. There is constant communication between parties, ensuring that everyone is on the same page and working towards the same goal.

Swift Time to Market

With Agile development, the project typically is delivered in small increments, which allows for faster launch times. Businesses can use this speedy time to market as a competitive advantage.

Disadvantages of Agile Contracts

Increased Risk

While Agile offers adaptability and flexibility, it also comes with its own risk. The client may not have a clear idea of the final product until it’s completed, so there is an inherent risk that their expectations won’t be met satisfactorily.


With Agile development, ambiguity remains present in terms of timeliness, costs, and quality standards. Both parties need to work on resolving these ambiguities to reap the better benefits of the agile contract in custom software development.

Need for Active Involvement

Agile contracts require active involvement from both sides, which may not always be possible if the client has limited capacity.

Which One Is The Best Software Development Contract?

Choosing the right contract type depends mainly on your specific needs, priorities, and the nature of your project. If you require precision, predictability, and a fixed budget, then Fixed Price contracts are suitable.

On the other hand, if you prioritize flexibility, collaboration, and evolving requirements, then Agile contracts are more appropriate.

One factor that companies should consider when choosing between Fixed Price and Agile contracts is the level of control they are willing to relinquish. Under Fixed Price contracts, the vendor controls the overall project delivery, while Agile processes give clients more control over the final product.

Either contract type can work successfully, depending on the circumstances of the software development solutions. Ultimately, companies should choose a contract type that aligns with their goals, capacity, and development philosophy. It’s essential to weigh the pros and cons of each option critically and assess which model best suits the project’s specific requirements


Kokou Adzo is the editor and author of He is passionate about business and tech, and brings you the latest Startup news and information. He graduated from university of Siena (Italy) and Rennes (France) in Communications and Political Science with a Master's Degree. He manages the editorial operations at

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