The included population will undergo an objective assessment with pulmonary function tests and will be given questionnaires to evaluate their knowledge about asthma treatment. Afterwards, they will receive a brief educational intervention and will be scheduled for a follow-up visit at 6 months to reassess pulmonary function parameters and knowledge level.

Educational Intervention:

The nurse will deliver a brief health education session focused on:

1. Understanding the treatment. Provide clear information adapted to the patient's level, supported with visual aids.
2. Distinguishing between maintenance and rescue treatment. Explain the role of each medication with practical examples.
3. Assessment and correction of inhaler technique. Carry out a step-by-step demonstration and ask the patient to repeat the technique. Use educational materials (placebo devices, videos, diagrams) and reinforce learning with the teach-back method.
4. Promoting autonomy. Encourage the patient to take part in administering the medication and foster self-management of the device.
5. Evaluating and improving adherence. Suggest daily routines, reminders, and the use of alarms or mobile apps.
6. Appropriate use of rescue medication. Involve the patient in decision-making, promote self-observation, and provide a clear action plan.

For the qualitative variable "inhaler technique," the Inhaler Technique Questionnaire (InTeQ), validated in pediatrics for the use of pressurized inhalers, will be used. This questionnaire includes 5 items considered critical, with an additional item, "shake the device," added for those using pMDIs.

The 5 critical steps assessed are: exhale completely before inhalation, close lips firmly, inhale deeply, hold breath afterward, and exhale slowly, which are applicable to both pressurized metered-dose inhalers (pMDI) with a spacer and dry powder inhalers (DPI). The item "device activation" was removed, as it is inherent to the procedure and to facilitate practical applicability.

It will be used the only specific questionnaire designed to measure adherence to inhalers, called the Inhaler Adherence Test (IAT). It consists of 10 items to be completed by the patient/caregiver when we want to identify patients with low adherence, and 2 additional items to be completed by the healthcare professional, which are specifically intended to determine the type of unintentional non-adherence.