What qualities do you think are important to be successful in this field?

Good answer
The qualities necessary to be successful in this field would
include the skills and knowledge to actually do the job properly.
I’m not just talking about all the technical skills, such as
knowing how to operate the various software programs and
a comprehensive knowledge of the relevant legislation and
how to apply that legislation, but also an ability to get on
with people, possess great communication skills and know
how to plan and organize your work whilst working under
considerable pressure. I also think high levels of motivation
and drive are very important. These are all qualities that I
possess and can bring to this position from day one.
Not so good answer
The qualities necessary to be successful in this field would
include a detailed understanding of all the various software
programs required to complete operations. Not only does one
require knowledge of how to operate the software but also
how to fix things when they go wrong and something is
always going wrong. The same can be said for the complex
legal technicalities. As you well know, in our industry the
devil is in the detail and a superficial understanding of the
legislation can lead to a lot of trouble. As well as having a
thorough understanding of all the programming requirements
of this job, I also have a comprehensive knowledge of the
legal subtleties.
Comments
This type of question invites you to go directly to the main duties
of the job you’re applying for and use those as your answer (it is
the same strategy that’s used in answering the motivation question).
The first answer does just that. It is superior to the second response
because it covers more bases. As well as talking about the technical
skills, it also talks about getting on with people, planning and
organizing, and good communication (the generic competencies).
The second answer is not a bad one, but it falls into the common
trap of only focusing on the technical side of the job.