The first score used to evaluate nursing workload was based on items determining patient condition severity and focused on the interventions or treatments received. This score was named the Therapeutic Intervention Scoring System TISS.
La primera escala empleada para valorar la carga de trabajo de enfermería se diseñó a partir de elementos que determinaban la gravedad del enfermo, centrándose de manera fundamental en las intervenciones o tratamientos que se aplicaban a esos pacientes.