According to UNESCO, the collection or documentary collection of a specialized library must belong, for the most part, to a specific branch of knowledge. The collection of this type of library is undergoing a digitization process. This is because several specialized information units have their retrospective collection on paper and need to be modernized for reasons of space, economy and ecology. According to Vellosillo González, it is generally accepted that in most specialized libraries the collection has three main components:

Parallel to these components, we can detail the types of documents that the collections of specialized libraries most frequently contain. These are:

"The information collected by the specialized centers is aimed at people who work or collaborate with the entity or institution to which the library is linked. Most of these professionals will have high-level training in studies and professional development, which means that their information requirements require effective responses. It is also aimed at very specialized users interested in the subject matter that the library deals with."[2]​.

The users of this type of libraries tend to be, for the most part, knowledgeable about the topics they require, qualified experts often belonging to the institution in which the library is located; They generally demand constant information about new information that occurs in their professional and study field, whose degree of complexity and needs usually make contact with summaries or abstracts of the information to be consulted essential, to achieve greater speed in satisfying their requirements. It is common for certain topics to generally request it from the librarian and deposit the selection of materials to be retrieved there, since they must trust the librarians for the search and retrieval of information and expect a precise response. “He will be a demanding user, who seeks quick and appropriate solutions to his demands and who wants to have constant information about the news that occurs in the professional and study field” (Vellosillo González: 1997).

Users who are interested in the topic they present or if they have to carry out work related to the background of the information unit can also attend.

Queries are answered in person or remotely (through the user form that appears on the web pages of the information units). There are answers that can be answered at the moment, and others that require elaboration and selection of the user's request. The needs of the users of the specialized library are homogeneous and determined, since they require specific documents such as theses, dissertations, scientific articles, magazines, conferences and courses on the specialty.

According to Lacal Seijo[3]​ and his experience, the most frequent demands are:

According to UNESCO, the collection or documentary collection of a specialized library must belong, for the most part, to a specific branch of knowledge. The collection of this type of library is undergoing a digitization process. This is because several specialized information units have their retrospective collection on paper and need to be modernized for reasons of space, economy and ecology. According to Vellosillo González, it is generally accepted that in most specialized libraries the collection has three main components:

Parallel to these components, we can detail the types of documents that the collections of specialized libraries most frequently contain. These are:

"The information collected by the specialized centers is aimed at people who work or collaborate with the entity or institution to which the library is linked. Most of these professionals will have high-level training in studies and professional development, which means that their information requirements require effective responses. It is also aimed at very specialized users interested in the subject matter that the library deals with."[2]​.

The users of this type of libraries tend to be, for the most part, knowledgeable about the topics they require, qualified experts often belonging to the institution in which the library is located; They generally demand constant information about new information that occurs in their professional and study field, whose degree of complexity and needs usually make contact with summaries or abstracts of the information to be consulted essential, to achieve greater speed in satisfying their requirements. It is common for certain topics to generally request it from the librarian and deposit the selection of materials to be retrieved there, since they must trust the librarians for the search and retrieval of information and expect a precise response. “He will be a demanding user, who seeks quick and appropriate solutions to his demands and who wants to have constant information about the news that occurs in the professional and study field” (Vellosillo González: 1997).

Users who are interested in the topic they present or if they have to carry out work related to the background of the information unit can also attend.

Queries are answered in person or remotely (through the user form that appears on the web pages of the information units). There are answers that can be answered at the moment, and others that require elaboration and selection of the user's request. The needs of the users of the specialized library are homogeneous and determined, since they require specific documents such as theses, dissertations, scientific articles, magazines, conferences and courses on the specialty.

According to Lacal Seijo[3]​ and his experience, the most frequent demands are: