Nowadays the infrastructure IT team is struggling on manage their projects because urgent daily tasks (out of the project) or new projects are gaining priority over their actual projects. Due to this situation, it is difficult for them to adopt and implant project management culture and get a more organized and professional environment on that company sector.
As one of the projects' main objectives is always failing (delivery on schedule), they are exposed and thinking of not following our project management practices anymore.
The team is reduced and it is not allowed to divide the team to focus on projects separately.
In this scenario, what would you recommend? Any tips following any project methodology are welcome.
Edit: One real example is having to assist an employee from another department (an internal client) in creating an e-mail account, giving a systems support, replacing printer toner, etc., instead of focusing on implanting the Active Directory (a very important project). Day by day, some new task appears and has to be done ASAP.