What does SD mean in CHEMISTRY

Structured Design is a software engineering technique for designing computer systems by breaking them down into manageable, simpler components. It uses top-down decomposition to create a hierarchical structure of modules in order to make the system more organized and efficient.

Using SD allows developers to create systems with more clarity and organization. It also makes it easier to maintain the system over time because the components are more modularized and independent from each other. Additionally, SD helps developers identify potential problems at an earlier stage in the development process because they can see how different parts interact with one another.

SD typically follows a top-down approach, where complex tasks are broken down into smaller, more manageable ones. First, the requirements are identified and the scope of the project is defined; then the system is decomposed into subsystems or modules; finally, each module is further decomposed into its own individual components until all tasks have been decomposed into their most basic components.

Edward Yourdon is credited for introducing Structured Design in his 1975 book “Structured design” as part of his general contribution to bettering software development processes. His methodology focused on producing clear modules with stable interfaces that could be reused and easily maintained over time. In addition he created a set of metrics to better measure quality and performance of systems built using SD principles such as coupling metrics and magnitude metrics.

No special tools are required for implementing Structured Design; all that is needed is clear thinking, disciplined coding practices and careful management of dependencies between modules and components within a system/project.