Higher-order functions are fundamental in functional programming as they enable functions to be treated as first-class citizens. This allows for functions to be returned from other functions or passed as arguments, which leads to powerful and flexible code constructs, such as mapping and filtering functions.

The blank should be filled with "Pair Programming." Pair programming is a software development technique where two programmers collaborate on the same task. They work together at one workstation, taking turns as the "driver" and the "observer" to improve code quality.

A User Story is a concise description of a feature or functionality from the perspective of an end user. It is a common practice in Agile development to capture user requirements and expectations in a format that is easily understandable by both developers and users.

Inaccurate requirements gathering and documentation can lead to significant challenges in a project. It can result in increased project costs, delays, scope creep, and stakeholder dissatisfaction due to misunderstandings and misaligned expectations.

The Agile Model allows changes at any point in the development process, offering flexibility to adapt to evolving requirements and market conditions. It employs iterations and welcomes changes to deliver better results.

The _____ prototyping model is known as the "Throwaway" or "Rapid" prototyping model. In this approach, disposable models are created, and each one is built based on feedback received from the previous one, enabling rapid exploration and testing of ideas.

A software patch is a minor software release that is typically designed to fix vulnerabilities, bugs, or improve performance without major changes to the software. It's a crucial part of software maintenance.

The "Evaluation" phase in Software Architecture Design is crucial to ensure the architecture aligns with required standards and specifications.

The primary principle of TDD is to write tests before writing the code. By doing so, developers create a clear vision of the expected outcome and ensure that their code meets these expectations.

The primary purpose of using prototyping tools is to create visual representations of the software's user interface and interactions. It helps designers and stakeholders visualize and refine their ideas and requirements before actual development begins, leading to a better final product.