The main idea here is how many people will be available to fill future jobs. A supply forecast in workforce planning estimates the number and mix of employees you can expect to have, from both internal sources (current staff, promotions, transfers) and external sources (applicants you can hire, contractors), after accounting for expected retirements, resignations, terminations, and planned hires. This helps determine whether your current workforce can meet projected demand or if gaps will appear, so you can plan recruiting, training, redeployment, or succession strategies. Why this fits best: it captures the forward-looking view of available talent, not just current headcount, and it includes both internal and external possibilities along with expected losses and gains. Why the other ideas don’t fit: forecasting supplier lead times relates to purchasing from vendors rather than staffing levels; predicting only internal hires misses the external labor market; and analyzing a marketing supply chain isn’t about workforce availability.

Decide how you’ll use the information. This upfront planning step sets the purpose, scope, and application of the job analysis. By clarifying why you’re analyzing jobs—whether for recruitment, selection, training, compensation, or performance management—you determine which jobs to study, who you’ll gather data from (incumbents, supervisors, or others), which data-collection methods to use (interviews, questionnaires, observations), and what outputs you’ll produce (job descriptions, job specifications, or required KSAs). This alignment keeps the analysis focused on real HR needs and ensures the results support decisions you’ll actually make. Drafting job postings is something you do after you have job descriptions and specifications, and determining salary ranges follows from the analysis results. Defining job duties is part of collecting and analyzing data, not the initial planning step that sets the direction for the entire analysis.

Time-to-fill measures how long it takes to move from spotting a vacancy to having that position filled. It tracks the number of days from when the job opening is posted (or approved) to when a candidate is hired and the vacancy is filled. This metric helps gauge recruiting efficiency, identify slow points in the process, and benchmark performance over time or against peers. It’s different from onboarding time (which starts after hire) and from cost-related metrics or applicant volume (which counts applicants rather than how long the process takes). In short, the focus is on the speed of filling the vacancy itself.

Understanding what Job Analysis Work Activities are helps distinguish the concrete tasks people actually perform on the job. These are the specific actions workers carry out as part of their daily duties—things like cleaning, selling, teaching, or painting. This focus on the observable tasks makes work activities the core element when you’re detailing what the job entails in practice. Other elements described in job analysis are broader or more about context. A list of the job’s duties and reporting relationships covers major responsibilities and where the position fits in the organization, not the precise tasks performed. Tools and materials processed relate to the equipment and inputs used, which is about resources rather than the sequence of activities. Information about how work is performed in terms of why and when centers on methods, rationale, or timing of tasks, rather than the actual activities themselves.