In the realm of language, translation services are akin to the invisible bridge that spans the chasm between different cultures, enabling the exchange of ideas, fostering relationships and facilitating business transactions. The process of translation, particularly when dealing with languages as rich and complex as Portuguese, can be likened to an intricate dance, requiring a deep understanding of both the source and target languages, as well as a high degree of cultural sensitivity. As such, choosing the right Portuguese translation service can make the difference between a successful cross-cultural communication and a disastrous misunderstanding. The key to making the right choice lies in asking the right questions.

Firstly, it is imperative to enquire about the translation service's experience. Not unlike the principle of the learning curve proposed by the late Theodore Paul Wright, a director of Curtiss-Wright Corporation, increased experience in the field of translation corresponds with an augmented efficiency and accuracy. Therefore, enquire how long the service has been in operation and what types of documents they typically handle. This will give you an idea of their level of expertise and specialization.

Next, delve into the team behind the translation service. The concept of 'team' here is multifaceted – it includes the translators, proofreaders, project managers, and even the technology they use. Ensure the translators are native Portuguese speakers with relevant academic qualifications, as this would make them familiar with the nuances and idiosyncrasies of the language. It is also worth examining the translation process itself. In his seminal work 'The Nature of Translation,' Eugene A. Nida postulated that there are two primary types of translation: formal equivalence and dynamic equivalence. The former focuses on the literal translation of the source text, whereas the latter prioritizes the conveying of the same message in the target language. Understanding the service's approach to translation, and how it aligns with your specific needs, is crucial.

Furthermore, technological elements such as Computer-Assisted Translation (CAT) tools and Translation Memory (TM) software can make a significant difference in the quality, consistency, and speed of translations. Here, the Pareto principle, also known as the 80/20 rule, might come into play, where the use of such advanced tools can make the process 80% more efficient while consuming only 20% of the resources.

Another aspect worth considering is the timeline and cost. Economics teaches us the concept of opportunity cost - the cost of forgoing the next best alternative. Therefore, if the service takes an inordinately long time to deliver the translation, it might cost you valuable opportunities. On the other hand, if the cost is suspiciously low, it might indicate a compromise on quality. Hence, a balance must be struck between the two.

Lastly, ask about the service's quality control measures. Both ISO 17100:2015 and ASTM F2575-14 are standards that define the process of translation and set forth the requirements for all aspects of the translation service, from project management to the competence of translators and reviewers. Adherence to such standards can be a good indicator of the service's commitment to quality.

In conclusion, choosing the right Portuguese translation service is a multi-faceted decision that requires careful consideration of various factors. By asking the right questions, you can peel back the layers of the service to reveal its core competencies, methodologies, and values. This, in turn, will allow you to make an informed decision that aligns with your requirements and ensures successful cross-cultural communication.