A broad science background is very important. An ability to recognise small inconsistencies is equally important. For example do you recognise small discrepancies between different camera shots of the same scene in films and TV series?
An ability to question everything and think laterally is important. Also the ability to say 'no' (not everyone is comfortable doing this). Working in quality is not about being popular and definitely not about being a tyrant but one needs to be approachable, consistent and have good interpersonal skills.
Not all of your decisions are going to be popular but they need to be based on a sound rationale and you need to be able to support them. One also needs to be acutely aware of the fact that your opinion won't always be right.
One must always be open to being convinced of an alternative argument.
Realists are usually interested in 'things' - such as buildings, mechanics, equipment, tools, electronics etc. Their primary focus is dealing with these - as in building, fixing, operating or designing them. Involvement in these areas leads to high manual skills, or a fine aptitude for practical design - as found in the various forms of engineering.
Realists like to find practical solutions to problems using tools, technology and skilled work. Realists usually prefer to be active in their work environment, often do most of their work alone, and enjoy taking decisive action with a minimum amount of discussion and paperwork.