To advance the national early intervention agenda, priority must be as
signed to the evaluation of services for families of infants and young
children with developmental disabilities. This priority for evaluatio
n rests on current considerations for accountability to families, acco
untability to funding sources, and the need for program documentation.
Evaluation of ongoing interventions involving home- and center-based
services for infants, toddlers, and their families, however, needs to
focus on questions different from those for empirical research on earl
y intervention efficacy. To this end, eight questions pertaining to th
e evaluation of clinical interventions can be viewed. Within the frame
work of an intervention cycle, referral, assessment, intervention plan
ning, service implementation, and follow-up are discrete elements defi
ning a sequence of encounters of children and families with service sy
stems. This article illustrates the use of the intervention cycle as a
framework for evaluation of clinical interventions and identifies rep
resentative measures and strategies appropriate for evaluation of each
element of the cycle.