Onboarding or "on-boarding" is a management term used for the process of handling new employees to obtain the best results from them. It can also refer to the early stages of a new client relationship during which a period of orientation and understanding takes place.
Proponents of the practice of onboarding have described is as being more than orientation, and emphasize the importance of making the most of the "honeymoon" stage of a hire, a period which has been described as being 90 days  or 100 days .
Rather than delegating the job of training the newcomer to a co-worker (called the "Just follow Joe around" method by one commentator)  or having the employee watch a video presentation, or letting the employee learn on his or her own by trial and error, proponents of onboarding advocate assigning the process to a person designated as an "onboarding manager", or a similar title reflecting specific responsibility for new hires.
Various writers have devised their own system of mnemonics when describing what an onboarding manager should remember and the sequence in which the methods should be carried out. One description refers to a four step process of "acquiring, accommodating, assimilating and accelerating" new hires (and includes a fifth "a", referring to "aligning" other members of the management to the need for revising new hiring procedures to include an onboarding process). . Another refers to a four step "a.i.d.e." process of "acclimation, integration, dialogue and expectation management". 
- Michael Watkins, The First 90 Days, (Harvard Business School Publishing, 2003) ISBN 1591391105)
- "That tricky first 100 days", The Economist, July 15, 2006
- Max Messmer, Human Resources Kit for Dummies (2d. Ed.) (Wiley Publishing, Inc, 2007), p145
- George Bradt, et al., The New Leader’s 100-Day Action Plan (J. Wiley and Sons, 2006, revised edition 2009) - ISBN 9780470407035;
- "How to Take the Reins At Top Speed", by Jena McGregor, Business Week, February 5, 2007
- George Bradt and Mary Vonnegut, Onboarding: How To Get Your New Employees Up To Speed In Half The Time, (John Wiley & Sons, 2009) - ISBN 0470407034)
- J. Leslie McKeown, Retaining Top Employees (McGraw-Hill, 2002), p153