On the other hand, if the project is optional, few or no people could take the opportunity. Classes are already so full with other material that this can be a burden on time. Each professor must make sure that the service-learning project will fit into reasonable time limits and should consider replacing something in the course with the project. Students can run into time problems outside of class. Due to family and work requirements, a student may not be able to commit to a certain day or time for community service.
Flexibility is the key element here.
There may be some legal issues with liability to consider. Students should not be placed in a site where they are likely to injure someone or get injured. If a professor is concerned about a liability issue, he or she should contact the college administration. Some instructors may choose to emphasize the learning, while others may stress the service, but both are integral parts of the whole project. There are many reasons.