Which representation communicates recommendations but does not have to be followed?

The term "Should" communicates recommendations that are intended to guide best practices, but it is not obligatory. This allows for flexibility in implementation, suggesting that while it is advisable to follow the recommendation, there is no requirement to do so. This approach acknowledges that in certain situations, alternative methods might be acceptable or even preferable, accommodating various project conditions or client needs.

In contrast, "Code" and "Standard" typically describe mandatory requirements that must be adhered to, encompassing legal regulations or established criteria that must be followed to ensure safety and compliance. The term "Shall," in similar fashion, conveys a definitive requirement that must be implemented, leaving no room for discretion. Thus, the distinction lies in the degree of obligation associated with each term, with "Should" being the most flexible, allowing for professional judgment and discretion in applying the recommendation.