Numerous longitudinal studies attest to the concern regarding the long-term effectiveness of remedial programs (Balow, 1965; Balow & Blomquist, 1965; Buerger, 1968; Muehl &' Forell, 1973; Robinson & Smith, 1962; Shearer, 1966). While short-term improvement has been demonstrated repeatedly, the majority of the reported studies fail to demonstrate maintenance of achievement gains (Spache, 1980). The fact that follow-up studies persist (Bessai & Cozac, 1980; Gottesman, 1979; Ito, 1981; Miles, Foreman & Irwine, 1978) demonstrates an intuitive belief that remedial treatment should have lasting beneficial effects.
Rennie, B. J., Braun, C., & Gordon, C. J. (1986). Long-Term Effects of Clinical Intervention: An In-Depth Study. Reading Horizons, 27 (1). Retrieved from http://scholarworks.wmich.edu/reading_horizons/vol27/iss1/2