In Scrum, quality is defined as the ability of the completed product or deliverables to meet the Acceptance Criteria and achieve the business value expected by the customer.
To ensure that a project meets quality requirements, Scrum adopts an approach of continuous improvement whereby the team learns from experience and stakeholder engagement to constantly keep the Prioritized Product Backlog updated with any changes in requirements. The Prioritized Product Backlog is simply never complete until the closure or termination of the project. Any changes to the requirements reflect changes in the internal and external business environment and allow the team to continually work and adapt to achieve those requirements. The fact that Scrum, through repetitive testing, requires work to be Done in an incremental fashion through Sprints rather than waiting until the end to produce deliverables results in errors being fixed right away, rather than postponed. Moreover, important quality-related tasks (e.g., development, testing, and documentation) are completed as part of the same Sprint by the same team—this ensures that quality is inherent in any Done deliverable created as part of a Sprint. Thus, continuous improvement with repetitive testing optimizes the probability of achieving the expected quality levels in a Scrum project. Constant discussions between the Scrum Core Team and stakeholders (including customers and users) with actual increments of the product being delivered at the end of every Sprint, ensures that the gap between customer expectations from the project and actual deliverables produced is constantly reduced.
Quality and Scope
Scope and quality requirements for a project are determined by taking into consideration various factors such as the following:
- The business need the project will fulfill
- The capability and willingness of the organization to meet the identified business need
- The current and future needs of the target audience
Scope of the project is the sum total of all the product increments and the work required for developing the final product. Quality is the ability of the deliverables to meet the quality requirements for the product and satisfy customer needs. In Scrum, the scope and quality of the project are captured in the Prioritized Product Backlog and the scope for each Sprint is determined by refining the large Prioritized Product Backlog Items (PBIs) into a set of small but detailed User Stories that can be planned, developed, and verified within a Sprint.
The Prioritized Product Backlog is continuously groomed by the Product Owner. The Product Owner ensures that any User Stories that the Scrum Team is expected to do in a Sprint are refined prior to the start of the Sprint. In general, the most valuable requirements in solving the customers’ problems or meeting their needs are prioritized as high and the remaining are given a lower priority. Less important User Stories are developed in subsequent Sprints or can be left out altogether according to the customer’s requirements. During Sprint execution, the Product Owner, customer, and the Scrum Team can discuss the list of features of the product to comply with the changing needs of the customers.
Quality and Business Value
Quality and business value are closely linked. Therefore, it is critical to understand the quality and scope of a project in order to correctly map the outcomes and benefits the project and its product must achieve in order to deliver business value. To determine the business value of a product, it is important to understand the business need that drives the requirements of the product. Thus, business need determines the product required, and the product, in turn provide the expected business value.
Quality is a complex variable. An increase in scope without increasing time or resources tends to reduce quality. Similarly, a reduction in time or resources without decreasing scope also generally results in a decrease in quality. Scrum believes in maintaining a ʺsustainable paceʺ of work, which helps improve quality over a period of time.
The Scrum Guidance Body may define minimum quality requirements and standards required for all projects in the organization. The standards must be adhered to by all Scrum Teams in the company.