Fara a consulta google, dictionarul, sau orice alte lucrari de referinta, este vorba de o persoana dedicata. Nu neaparat in exclusivitate. Cu alte cuvinte, 4 sau 5 copii pot avea o persoana dedicata, stiu de la scoala de la baietelul meu.

key worker
n
(Business / Professions) a social or mental health worker assigned to an individual case or patient
In comunicatul de mai jos se vorbeste despre rezultatele implementarii unui program englezesc adaptat la Republica Moldova, unde terminologia este inca in formare de pilda:

Ministerul Educaţiei, cu sprijinul Asociaţiei Obşteşti „Lumos Foundation Moldova”a lansat serviciul de asistenţă psihopedagogică în raioanele Floreşti şi Ialoveni
Chişinau, 7 Decembrie 2011 —

Each child has a designated key worker. This is a member of staff who is of prime importance to your child, acting as a link between home and nursery. They will address any queries or concerns that you may have. At Nursery your key worker is the person with whom your child will develop the closest relationship. They are in charge of overseeing your child’s care as well as their emotional and physical well being. Our routine allows your child plenty of one-to-one contact with their key worker. During this time your child’s needs and capabilities will be observed and this information will highlight how the key worker will support, encourage and challenge them in the future.

Propun acest termen fiindca in UK acestia nu sunt de regula persoane cu calificari in domeniu, adica nu sunt dupa criteriile romanesti asa-numiti psihopedagogi calificati, insa trainingurile prin care trec ii certifica drept asistenti in psihopedagogie.
Si este ceea ce se va intampla si in Moldova, teoretic, pentru reducerea costurilor prin folosirea de cadre necalificate in pozitii in care nu este necesara calificarea.

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Note added at 22 ore (2012-01-03 22:05:44 GMT)
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ii putem numi si "muncitorii/lucratorii cheie" doar ca nu imi pre suficient de sugestiv. Poate "personalul cheie"? Pana la urma este vorba de acei membri ai personalului care joaca rolul cel mai important pentru fiecare caz individual in parte
What is a "key worker"?
Police, Nurses, Teachers, social workers, Heath care assistants, Support workers, Cleaners and generally staff who play a crucial role in the social services sector.

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Note added at 22 ore (2012-01-03 22:07:28 GMT)
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Instruirea personalului cheie din cadrul IMM-urilor pentru dezvoltarea abilitaţilor manageriale si promovarea spiritului antreprenorial

http://www.ro-consult.ro/index.php?cat=55&action=showproduct...