The relevant sources to be analyzed in order to set targets are:

Target setting is stronger when it triangulates multiple sources: historical data shows your baseline and internal variability; market analysis reflects shifts in demand, pricing, competition, and customer expectations; and external benchmarking provides reference points for what peers or best-in-class performance can look like. Because each contributes a different lens, “All the answers” is the correct choice. Relying on only one source creates risk: historical-only targets can lock in mediocrity or ignore new conditions; benchmarking-only targets can be unrealistic if definitions differ or resources aren’t comparable; market-only targets can be aspirational without operational grounding. Measurement challenges include comparability (different KPI definitions across organizations) and regime changes (new products, new systems) that make past data less predictive. Good practice is to document the rationale for targets, specify the period used, and revisit targets when strategy or operating context materially changes—while keeping KPI definitions stable to preserve trend integrity.