http://www.ucl.ac.uk/hr/od/coaching/differences.php
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Coaches need not have first-hand experience of the coachee's line of work. The coach can be an independent external professional with expertise in coaching, or a qualified UCL internal coach.        | 
Mentoring is customarily a planned pairing of a more skilled or experienced person (usually in the same field of work) with a less experienced person. | 
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Line managers can use coaching techniques successfully in the management and development of team members. | 
Ideally mentors have no line management relationship to the mentee. | 
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Coaches will ask 'powerful' questions and not offer or give advice.. | 
Mentors will often provide direction and advice and should 'open organisational doors' for mentees. | 
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A number of both internal and external coaches are available with a variety of backgrounds and expertise and the services they provide tie in with the organisation’s objectives. | 
Mentors can provide a neutral 'sounding board', assure total confidentiality, and have no agenda other than assisting their mentees in their development and to reach their goals. | 
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Effective coaching is intended to help you to learn rather than by “teaching” you.  By engaging with an experienced coach, the coachee will develop insights leading to enhanced effectiveness. | 
Mentoring involves helping mentees to develop their career, skills and expertise often drawing upon the experiences of the mentor in the process. | 
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Coaching | 
Mentoring | 
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Relationship
  generally has a set duration | 
Ongoing
  relationship that can last for a long period of time | 
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Generally
  more structured in nature and  meetings are scheduled on a regular basis | 
Can
  be more informal and meetings can take place as and when the mentee needs
  some advice, guidance or support | 
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Short-term
  (sometimes time-bounded)  and focused on specific development
  areas/issues | 
More
  long-term and takes a broader view of the person | 
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Coaching
  is generally not performed on the basis  that the coach needs to have
  direct experience of their client’s formal occupational role, unless the coaching
  is specific and skills-focused | 
Mentor
  is usually more experienced and qualified than the ‘mentee’. Often a senior
  person in the organisation who can pass on knowledge, experience and open
  doors to otherwise out-of-reach opportunities | 
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Focus
  is generally on development/issues at work | 
Focus
  is on career and personal development | 
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The
  agenda is focused on achieving specific, immediate goals | 
Agenda
  is set by the mentee, with the mentor providing support and guidance to
  prepare them for future roles | 
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Coaching
  revolves more around specific development areas/issues | 
Mentoring
  resolves more around developing the mentee professional | 
 
