The dwellings that were randomly selected to carry out the census may be notified of this by:

• Receiving one or more letters at the dwelling in which they are asked to provide the INE with census information, either online or by regular post using the envelope provided for this purpose.
• Receiving a visit from a duly accredited census agent, who will request that the household complete the questionnaires, either leaving an envelope together with the census questionnaire, which should be sent by post once completed, or else using the mobile device that the agent has on his or her person in order to complete the information directly.

By all means. Should you be selected as part of the sample, in order to be able to respond to online questionnaires, you need only enter in a web browser the URL appearing in the letter sent to the household, then authenticate the dwelling with the user ID and password that were sent.

The online method is of note due to it being the fastest, most streamlined and most convenient method for households. Moreover, processing of electronic information has a host of advantages when compared with information on paper, allowing greater speed when processing information, ensuring the utmost quality and guaranteeing confidentiality of the information sent.

If you encounter problems when answering the census questionnaire, you may:

• Call the round-the-lock, free-of-charge help line, which will deal with any query you might have.
• You will find useful information for completing the questionnaire by visiting the website shown on the questionnaire.

All persons habitually residing in the dwelling selected should be included.

What is meant by persons habitually residing in the dwelling?
• On the one hand, those persons who have been living in that dwelling on an ongoing basis during the twelve months prior to the census.
• On the other hand, those persons who have come to live in the dwelling less than twelve months ago, but who intend to remain in the dwelling for at least a year.

A few specific cases require further clarification. For example:

• Persons working away from home during the week and returning to the dwelling on weekends should be shown in the census as living the latter.
• Students who live away from home during term-time should be shown in the census as living in the dwelling with their parents.
• If a person resides in more than one dwelling throughout the year, he or she should be shown in the census as living in the one where he or she spends most time. This rule also applies to children alternating between several dwellings (for example, if their parents are divorced).

Persons choosing to respond to the Census online may answer:

• In Castilian Spanish
• In the following co-official languages of Spain: Balear, Catalan, Galician, Valencian and Basque.
• In other languages: English, French, German and Rumanian. In addition to these languages online, Arabic will be available.