An organization is selecting a training evaluation method.

HRPA’s Learning and Development guidance positions evaluation designs along a rigor–cost/time continuum.

Post-test only (B) is lowest cost/time but offers low validity because there is no baseline for comparison.

Solomon Four Group (C) provides the highest validity but is resource-intensive (multiple groups and measures).

Time series (A) requires repeated measures and more time/analysis.

Pretest/post-test (D) balances practicality and rigor by establishing a baseline and follow-up with manageable cost/time, delivering moderate validity appropriate for the stated constraints.Relevant HRPA references: Learning and Development—evaluation strategies; matching evaluation design to resource constraints and required validity.