En las investigaciones en que se comparan tratamientos psicológicos teóricamente eficaces con procedimientos teóricamente inactivos suele aconsejarse como práctica metodológica evaluar las expectativas de los sujetos. Sin embargo, la evaluación de esta variable cognitiva presenta problemas metodológicos importantes que se articulan básicamente en torno al cómo y al cuándo de la evaluación. En el presente trabajo se analizan tales problemas metodológicos y se apuntan algunas soluciones, partiendo de la distinción conceptual entre expectativas de resultados y expectativas de eficacia.
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