The shift-left concept of code release cycles is a practice that aims to integrate testing, quality, and performance evaluation early in the software development life cycle, often before any code is written. This helps to find and prevent defects, improve quality, and enable faster delivery of secure software. One of the key aspects of the shift-left concept is the incorporation of automation to identify and address software code problems early, such as using continuous integration, continuous delivery, and continuous testing tools. Automation can help reduce manual errors, speed up feedback loops, and increase efficiency and reliability123
The other options are not correct because:
Option A is not correct because large entities with slower release cadences and geographically dispersed systems are more likely to face challenges in adopting the shift-left concept, as they may have more complex and legacy systems, dependencies, and processes that hinder agility and collaboration. The shift-left concept requires a culture of continuous improvement, experimentation, and learning that may not be compatible with traditional or siloed organizations4
Option C is not correct because a waterfall model is the opposite of the shift-left concept, as it involves sequential phases of development, testing, and deployment that are performed late in the software development life cycle. A waterfall model does not allow for early detection and correction of defects, feedback, or changes, and can result in higher costs, delays, and risks5
Option D is not correct because maturity of start-up entities with high-iteration to low-volume code commits is not a sign of the shift-left concept, but rather a sign of the agile or lean software development methodologies. These methodologies focus on delivering value to customers by delivering working software in short iterations or sprints, with frequent feedback and adaptation. While these methodologies can support the shift-left concept by enabling faster testing and delivery cycles, they are not equivalent or synonymous with it6
References: 1: AWS. What is DevSecOps? - Developer Security Operations Explained - AWS. [Online]. Available: 4. [Accessed: 14-Apr-2023]. 2: Dynatrace. Shift left vs shift right: A DevOps mystery solved - Dynatrace news. [Online]. Available: 2. [Accessed: 14-Apr-2023]. 3: BMC Software. Shift Left Testing: What, Why & How To Shift Left – BMC Software | Blogs. [Online]. Available: 3. [Accessed: 14-Apr-2023]. 4: GitLab. How to shift left with continuous integration | GitLab. [Online]. Available: 4. [Accessed: 14-Apr-2023]. 5: DZone. DevOps and The Shift-Left Principle - DZone. [Online]. Available: 5. [Accessed: 14-Apr-2023]. 6: Devopedia. Shift Left - Devopedia. [Online]. Available: 6. [Accessed: 14-Apr-2023].
