John is planning his wedding. he has never been married and seeks input from his sister, lauren. lauren owns her own wedding

expert judgment

Explanation:

Expert Judgment refers to having acquired enough knowledge through experience at a certain trade that provides an individual with an expertise over that specific area or trade. The advantage of getting advice from an expert (i.e. a person that possesses expert judgment) is that they have a lot of experience in that area or trade, and they know how to manage any problems or issues that may arise.  

Since John's sister is a wedding planner, she probably has organized a lot of weddings and has gone through a lot of problems while organizing them. Hopefully she was able to solve them properly or at least knows how to solve them now.

Expert Judgement

Explanation:

Expert Judgment is a judgement which is based on expertise that has been acquired in a specific knowledge area, or a particular discipline, an industry, trade etc. This type of expertise may be provided by any group or person.This expert judgement works in the favor of the person getting it so as to avoid all the pitfalls you might fall into as a result of lack of expertise in that area or trade. Lauren in this case a wedding planner will be a good expert to work with because of her experience in the industry. The tool and technique John is using is called Expert Judgement for his wedding plans.

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