Waterfall Model Requirements Analysis

The process of understanding and documenting customer needs for a software project.

Documenting the collected and analyzed requirements.

Collecting data and understanding customer requirements.

One part of a requirement contradicting another.

Ambiguity or unclear requirements.

Missing or overlooked requirements.

A document that details software requirements.

Methods, such as interviews and discussions, used to collect requirements from end-users.

When different users have conflicting views on how the software should work, leading to inconsistencies in the gathered requirements.

When user statements are unclear or open to multiple interpretations, making it difficult to understand their exact needs.

When users miss important details or overlook some of their needs, leading to gaps in the gathered requirements.

Difficulties in gathering accurate and complete requirements due to user contradictions, ambiguities, and incomplete views of the system.

A document that records the analyzed and verified requirements after resolving any contradictions, ambiguities, or incompleteness.

A design method that focuses on breaking down system functionality into smaller modules through structured analysis and structured design.

A visual representation of data movement and processing within a system, used in structured analysis.

A design method that translates a DFD into a modular structure, defining the components and their relationships within a system.

A design approach where software is structured as interacting objects, focusing on relationships and building blocks.

Testing where separate software modules are combined and checked for proper communication and interaction.

Errors that occur when different software components fail to communicate or exchange data correctly.

Testing the complete, integrated software system to verify it meets all the requirements.

The ongoing process of fixing bugs, enhancing the software, and ensuring its functionality over time.

To verify that the developed software meets all the requirements specified in the SRS document.

After system testing is complete and the software is delivered to the customer.

Maintenance ensures software remains functional, bug-free, and adaptable over time.

The amount of work and resources dedicated to keeping a software project functional and up-to-date after its initial development.

Fixing bugs or defects found in software after it has been released.

Improving or enhancing software functionality beyond the original requirements or adding new features.

Changing software to work with new hardware, operating systems, or other external changes.

A software development model that progresses linearly through stages, with each stage completed before moving to the next.

The inability to easily revisit or change completed stages in the classical Waterfall model, even if errors are discovered later.

The expense incurred when correcting errors or issues discovered in later stages of development, potentially requiring revisiting earlier stages.

An inaccurate or incomplete software requirement that can cause problems during design, development, or testing.

Fixing a defect discovered in a later phase is much more costly than fixing it earlier. This is because you need to rework the results of previous phases. For example, a requirement issue found during testing might require changes to requirements, design, code, and retesting.

The iterative waterfall model adds feedback paths to the classical waterfall model. These allow revisiting previous phases to address defects discovered in later phases. This helps manage the cost of fixing defects.

The ideal scenario is to detect and fix errors within the same phase they are introduced. This minimizes the cost of correction and ensures faster development.

Phase containment of errors is important because it significantly reduces development costs. Correcting a design defect in the design phase is far more efficient than discovering and fixing it during coding or testing.

It's a common misconception that programmers are solely responsible for all defects. While programmers make mistakes, the core idea is to catch those errors early and efficiently to minimize rework.

The iterative waterfall model is a fundamental model in software development. Many other models are derived from it because it's a robust approach with feedback mechanisms.

Yes, correcting a defect in the same phase it was introduced is almost always the least expensive. This is because it minimizes rework and saves time overall.

Undiscovered defects can lead to significant rework and increased costs in later development phases, potentially impacting the project's success.

The waterfall model is simple to understand and use, even for inexperienced project team members, making it suitable for projects with well-defined requirements.

In a waterfall model, requirements are gathered and fixed at the beginning of the project. Changes are difficult to incorporate later.

The waterfall model can give a misleading sense of progress because milestones are reached early on, but issues can arise during the integration phase when components are combined.

A major drawback of the waterfall model is that integration testing happens at the end. This often leads to delays due to incompatibilities between different parts of the software.

The waterfall model can leave the customer uninformed about the project's progress, as there is limited feedback during development.

A significant drawback of the waterfall model is its inflexibility. It does not accommodate changing requirements effectively, which can hinder adaptation to evolving user needs.

The waterfall model often leads to delays because integration happens late in the project. As a result, issues between different parts of the software are not discovered until the end, leading to rework and project delays.

In a waterfall model, the customer typically receives feedback only at the end of the project, when the final product is delivered.