Final answer:
The most challenging part of the de jure standardization process is the implementation and enforcement phase, where regulations must be created that constrict non-compliant pathways effectively while being enforceable.
Step-by-step explanation:
The last and most difficult stage of the de jure standardization process is often the implementation and enforcement phase. This is the stage where regulations must be designed to be sufficiently stringent to effectively govern the behavior of those subject to the standards, ensuring that they adhere to the agreed-upon norms. Given the diverse and complex interests involved, creating regulations that are both enforceable and restrict non-compliant behavior remains a significant challenge. This difficulty centers on the need to balance regulatory strictness with practical enforceability, aiming to constrict pathways that would enable avoidance or non-compliance with the standardization efforts.