Abstract
The Degrees of Reading Power test was administered in three school districts to determine how well the test measures gains or losses over time. One time interval included summer noninstructional months (April 1981 through October 1981); the other time interval included only regular instructional months (October 1981 through April 1982). For the first interval, October 1981 scores were significantly higher than April 1981 scores in two of the three participating districts. For the second interval, April 1982 scores were significantly higher than October 1981 scores in all three districts. Longitudinal findings appear to reflect the effects of instruction and/or growth.
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