An update of the classic Bayley Scales, this test offers a comprehensive assessment of early childhood development. BSID-II® retains the broad content coverage that characterised the original scales and includes:

• The Mental Scale - which evaluates sensory/perceptual acuities, discriminations, acquisition of object constancy, memory, learning and problem-solving, vocalisation, early verbal communication and abstract thinking, habituation, mental mapping, complex language and mathematical concept formation.

• The Motor Scale - which evaluates degree of body control, co-ordination of large muscles, fine manipulation skills, dynamic movement, postural imitation and stereognosis. 

• The Behaviour Rating Scale - which measures attention and arousal, orientation and engagement, emotional regulation and motor quality. 

In clinical settings, the Bayley Scales have traditionally been used to evaluate the development of young children. The BSID-II® includes new items measuring a broader skill range.

It features improved stimulus materials and it's clinical utility has been extended by including data from a wide range of groups, including children born prematurely, having the HIV antibody, prenatally drug exposed, asphyxiated at birth, developmentally delayed, children with autism and children with Down's Syndrome.

This, together with an extended age range, revised norms, improved psychometric properties and non-restrictive administrative procedures, makes the BSID-II® a highly flexible instrument that allows you to meet the needs of the very young child.

Reliability Information
Average reliability coefficient: II E.G .88 (average mental scale)
Test-retest reliability: E.G .91 (mental scale for ages 24 and 36 mths)
Inter-rater reliability: .96 (mental scale)

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