This paper presents an intensive study that combines statistical methods to test the outcome and process of the psychotherapeutic treatments at the Servei d’Assessorament i Assistència Psicológica Blanquerna in Barcelona, and it analyzes in detail the relation between outcome (improvement) and process (therapeutic alliance). Specifically, the study analyzes (a) the psychotherapeutic process in terms of the relationship between therapeutic alliance and therapy outcome, and (b) the effect of therapeutic alliance ruptures and symptomatic worsening over therapy outcome and process. The clients included in this study were 239 and the assessment instruments were the CORE Outcome Measure and the reduced version of the Working Alliance Inventory. Results indicate the goodoutome of therapy and the importante of different aspects of the therapeutic alliance as predictors of the therapeutic process.