Final answer:
Line managers play a crucial role in the hiring process owing to their job-related insights, their responsibility for their team's performance, and the need to make thoughtful human capital investments.
Step-by-step explanation:
The involvement of line managers in the hiring process is crucial for several reasons. Firstly, line managers have job-related insights that HR may not possess; they understand the nuances of the job's responsibilities and the skills that are actually necessary for success in the role. Secondly, because they are responsible for the performance of their team, it's in their best interest to select candidates who they believe will be most effective and who can integrate well into their existing team dynamic. Lastly, participating in the hiring process allows line managers to make thoughtful investments in human capital, which aligns with the overall goal of developing and retaining talent within the organization.