Going forward, what method of HR planning should Joseph use to ensure that he is not surprised when people suddenly quit, thereby causing problems due to significant gaps in the workforce?

Joseph Bloom was confused and disappointed. As IT director for a medium-sized technology firm, he knew that he had to recruit and select 3-junior analysts as the people filling these roles had all quit within the past week. Joseph couldn’t believe that each person doing this job had left the company at the same time. This caused a huge gap in the workforce, and employees on this team were complaining that they would not be able to meet customer demands. Joseph knew he had to fix the problem and fix it fast!
As such, Joseph had convinced senior management that attending the local career fair was a strategic approach to generating interest in the company and acquiring resumés from students who would be graduating in the near future. The costs (registration fee, booth materials, salaries of employees who attended) were substantial, yet the response from students was dismal. Only about 20-people stopped by the booth, and of those who did, only 4-handed over a resumé.