Which of the following documents should be used to identify individual discrepancies and recommended solutions?

The appropriate document to identify individual discrepancies and recommend solutions is the performance improvement plan. A performance improvement plan (PIP) is specifically designed to address performance issues, outlining the discrepancies between expected performance and actual performance. It provides a structured approach for improving an individual's performance by identifying areas that need enhancement and setting measurable goals along with actionable steps. This focus on individual discrepancies makes it most suitable for developing tailored solutions to specific performance challenges.

While other documents like a letter of instruction, memorandum of understanding, and incident report may serve various administrative or operational purposes, they do not specifically target performance discrepancies or offer structured solutions for individual improvement in the same comprehensive manner as a performance improvement plan does.