LETTER OF INSTRUCTION (LOI) - A letter of instruction is not part of a progressive disciplinary process, it is a form of coaching. GENERAL INSTRUCTIONS: (a) Read the application carefully.Applications that are not complete will be subject to the late fee schedule. This document provides instructions for professional engineers (PEs) completing reference forms for PE license applicants in Nevada. Please see Appendix B for a sample due diligence letter. Complete both pages. Qualified applicants possessing current knowledge and teaching experience in the following topic area(s) are encouraged to apply. Find additional resources in the NIAID and NIH Sample Forms, Plans, Letters, Emails, and More section. The Agency's focus on both concerns is reflected in the dual path of its current registration process.