What is quality? Is the degree how we meet the expectation of users. This is to ensure that materials, products, processes, and services are fit for their purposes. Repeatable and scalable are two characteristics of a good pieces of software. (There should be more, for example, like good usability)
What is standard? Collection of best practices. Consultants or auditors always refer to the ISO/IEEE standards to polish up and summarize these before they apply it to the field. Following a standard depends on the degree of compliance. However, there are two questions you will need to ask yourself before apply any standards.
- Is BEST, good enough?
- Is GOOD ENOUGH, the best?