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Incorporating accessibility in software development brings significant benefits such as the inclusion of people with disabilities. Recognizing the diversity of users with different requirements and needs within software development facilitates its use by the greatest number of users regardless of their individual conditions. The objective of this research is to obtain a knowledge base to identify those practices for which there is evidence of their use in the development of accessible software. A Systematic Literature Mapping (SLM) focused on identifying practices that incorporate accessibility activities in the software life cycle was conducted, resulting in 29 studies that met the selection criteria. The results show that the phase with more evidence of incorporation of accessibility activities in software development is the testing phase, when testers are used to verify accessibility within web pages, followed by the construction phase, when methodologies that include accessibility within the software development process are used; in the design phase it is common to incorporate artifacts that guide the development of accessible software and, finally, in the requirements phase it is common to use the requirements description to obtain and document accessibility requirements. [ABSTRACT FROM AUTHOR]