Coaching vs mentoring

Side by side

The definitions

The CIPD defines both in its factsheet on coaching and mentoring.

Coaching, in its words, aims to produce optimal performance and improvement at work. It focuses on specific skills and goals, may also affect personal attributes such as confidence, and typically lasts for a defined period or forms the basis of an ongoing management style. Among the generally agreed principles it lists: coaching is essentially a non-directive form of development, it has both organizational and individual goals, and it is a skilled activity that should be delivered by people trained in coaching skills (CIPD, 2025).

Mentoring, in the same factsheet, describes a relationship in which a more experienced colleague shares their greater knowledge to support the development of an inexperienced individual. It calls on the same skills of questioning, listening, clarifying and reframing, and one key distinction is that mentoring relationships tend to be longer term than coaching (CIPD, 2025). Merriam-Webster's definition of a mentor is similar: a person who gives help and advice to a less experienced and often younger person, especially in a professional or academic context (Merriam-Webster, n.d.).

The factsheet also reports that line managers are most likely to take the main responsibility for delivering coaching, according to the CIPD's own learning surveys (CIPD, 2025). That makes coaching part of many managers' jobs, not only something bought from outside.

What the research says

Workplace coaching has positive trials, in single organizations.

• In a randomized controlled study of 41 executives, people who received 360-degree feedback, a half-day leadership workshop and four individual coaching sessions over 10 weeks showed higher goal attainment, resilience and workplace well-being, and lower depression and stress, than controls (Grant et al., 2009, rated Medium in the Evidence Library from its abstract). It was one organization and the outcomes were self-reported.
• In a waiting-list trial in a global healthcare corporation with 180 coachees, described by the authors as near-randomized, coaching showed substantial effects, with effect sizes up to d = 1.1. The strength of the working alliance between coach and coachee mediated the effects on coachee well-being and perceived social support (de Haan et al., 2019, rated Medium from its abstract). Most outcomes were reported by the coachees.

What makes coaching work is less settled. A systematic review of 117 workplace coaching studies identified seven recurring candidates: coachee self-efficacy, coaching motivation, goal orientation, trust, interpersonal attraction, feedback intervention and supervisory support (Bozer & Jones, 2018, rated Medium after a full-text read). The evidence for each is mostly correlational or self-reported.

The two mentoring reviews cited here describe mentoring more than they test it. A synthesis of adult mentoring frameworks from 1978 to 2012 found that recognized challenges in traditional mentoring led to the broader ideas of developmental networks and communities of practice (Dominguez & Hager, 2013, rated Medium from its abstract). A scoping review of 151 articles on mentoring and professional identity formation in medical education concluded that mentoring's success lies in blending role modelling, supervision, coaching, guided reflection and assessment to each mentee's needs, which puts weight on the host organization's support for mentors (Krishna et al., 2024, rated Medium from its abstract). Neither is a test of whether mentoring improves work outcomes.

The mentoring trials in the library are small. In a randomized study of a year-long group peer-mentoring program, 40 mid-career academic medicine research faculty rated psychological safety higher at the end than after the first session (5.6 to 6.1 on a 7-point scale) (Laird et al., 2024, rated Medium in the Evidence Library from its abstract). That is a before-and-after change among participants; the abstract reports no comparison with a control group.

So the plain answer is: coaching has the stronger tested evidence in this library, but the two trials cited here each ran in a single organization, one with 41 people, and both leaned on coachee reports. Mentoring has been tested less here, in smaller studies, which is a gap in the evidence, not proof that it does not work. No study in the library compares coaching and mentoring head to head.

How it maps to the Unfrozen Loop

1. Week 0
   Before you start
2. 1
   Surface both ways
3. 2
   Make sense together, top included
4. 3
   Start it close to the work
5. 4
   Review on a rhythm, then hold the pace
6. 5
   The middle’s own weather

   Coaching and mentoring are both forms of support for the person in the middle. The Loop's evidence for this part favors peers trading advice on the actual work, which is closer to mentoring among equals than to formal coaching.

7. Ring
   Safe to speak, and speaking changes something

Highlighted parts are the ones this idea speaks to. The mapping is my reading, not a tested finding. See the whole Loop and the evidence for each part.