Critically reflect upon the nature and meaning of social work practice by using a variety of written and technological tools-such as clinical notes and social networking, and other forms that communication can take
In the world outside of colleges and universities, self-plagiariam can lead to serious issues. There are even guidelines written to discuss the ethics and issues as to why authors should not "magnify" research findings by publishing things in more than one journal.
For Example:
"a description of a serious adverse pulmonary effect associated with a new drug used to treat cardiovascular patients was published twice, five months apart in different journals. Although the authors were different, they wrote from the same medical school about patients that appear identical. Any researcher counting the incidence of complications associated with this drug from the published literature could easily be misled into concluding that the incidence is higher than it really is (p.1).” (source: https://ori.hhs.gov/plagiarism-16)
Why would that be an issue?