United Nations Standard Minimum Rules for the Administration of Juvenile Justice (“The Beijing Rules”) 40/33

5.1 (…) The second objective is “the principle of proportionality”. This principle is well-known as an instrument for curbing punitive sanctions, mostly expressed in terms of just deserts in relation to the gravity of the offence. The response to young offenders should be based on the consideration not only of the gravity of the offence but also of personal circumstances. The individual circumstances of the offender (for example social status, family situation, the harm caused by the offence or other factors affecting personal circumstances) should influence the proportionality of the reactions.

By the same token, reactions aiming to ensure the welfare of the young offender may go beyond necessity and therefore infringe upon the fundamental rights of the young individual, as has been observed in some juvenile justice systems. Here, too, the proportionality of the reaction to the circumstances of both the offender and the offence, including the victim, should be safeguarded.

17.1 The disposition of the competent authority shall be guided by the following principles:

(a) The reaction taken shall always be in proportion not only to the circumstances and the gravity of the offence but also to the circumstances and the needs of the juvenile as well as to the needs of the society;

(b) Restrictions on the personal liberty of the juvenile shall be imposed only after careful consideration and shall be limited to the possible minimum;

(c) Deprivation of personal liberty shall not be imposed unless the juvenile is adjudicated of a serious act involving violence against another person or of persistence in committing other serious offences and unless there is no other appropriate response;

(d) The well-being of the juvenile shall be the guiding factor in the consideration of her or his case.

17.2 Capital punishment shall not be imposed for any crime committed by juveniles.

17.3 Juveniles shall not be subject to corporal punishment.

17.4 The competent authority shall have the power to discontinue the proceedings at any time.

Rule 17.1 (b) implies that strictly punitive approaches are not appropriate. Whereas in adult cases, and possibly also in cases of severe offences by juveniles, just desert and retributive sanctions might be considered to have some merit, in juvenile cases such considerations should always be outweighed by the interest of safeguarding the well-being and the future of the young person.

19.1 The placement of a juvenile in an institution shall always be a disposition of last resort and for the minimum necessary period. (…)

Rule 19 aims at restricting institutionalization in two regards: in quantity (“last resort”) and in time (“minimum necessary period”). Rule 19 reflects one of the basic guiding principles of resolution 4 of the Sixth United Nations Congress: a juvenile offender should not be incarcerated unless there is no other appropriate response. The rule, therefore, makes the appeal that if a juvenile must be institutionalized, the loss of liberty should be restricted to the least possible degree, with special institutional arrangements for confinement and bearing in mind the differences in kinds of offenders, offences and institutions. In fact, priority should be given to “open” over “closed” institutions. Furthermore, any facility should be of a correctional or educational rather than of a prison type.