What Works for Children with Literacy Difficulties? - Digital ...

11 Parental Involvement in Haringey
Main references: Tizard, Schofield and Hewison (1982), Hewison (1988)
Date: 1976-78
Age-range: Y2-3
Type of children: Mixed-ability
N of experimental group: 51 in 2 schools
N of main control group: 86 in same schools
N of alternative intervention (AI) group: 45 in 2 schools
Nature of alternative intervention: extra teacher help with reading
N of control group for alternative intervention: 66 in same schools as AI group
Equivalence of groups: The 4 schools were assigned at random to experimental and
alternative intervention groups; then one Y2 class in each was chosen randomly to receive the
experimental or alternative intervention; other Y2 classes became the controls; pre-test data
showed that experimental and alternative intervention groups did not differ from their
respective controls
Length of intervention in weeks: 104
Reading tests: (pre-test) Southgate; (post-test) NFER Reading Test A
Post-test average standardised scores and s.d’s:
ave. stand. score (s.d.)
experimentals 104.2 (10.8)
main controls 95.0 (11.0)
AI 99.3 (16.6)
controls for AI 98.1 (13.7)
Gain: could not be stated because unrelated tests used pre and post
Ratio gain: n/a
Effect sizes calculated using differences between post-test average scores over post-test
s.d’s of control groups:
experimentals 0.84
AI group 0.09
Statistical significances: at post-test, experimentals significantly higher than main controls,
alternative intervention group vs their controls ns
102