# 5-1 Concept & Requirements Definition

The Concept &amp; Requirements Definition (CRD) Stage of the [<span style="color: rgb(53, 152, 219);">Acquisition Management System (AMS)</span>](https://fast.faa.gov/) process begins with:

Contacting <span style="color: rgb(53, 152, 219);">[ANG-C1](https://www.hf.faa.gov/) </span>for guidance and determining whether it is appropriate to appoint a Preliminary FAA HF Coordinator (FAA HFC)

The Preliminary FAA HFC or the supporting HF participant then either completes the following activities or, for a larger projects, manages their completion by a vendor supporting CRD:

- Conduct or oversee HF activities: 
    - P. 5-2: [<span style="color: rgb(53, 152, 219);">Conduct HF assessments to support refinement of operational shortfalls</span>](#page_47)
    - P. 5-3. [<span style="color: rgb(53, 152, 219);">Conduct HF assessments to support refinement of concepts</span>](#page_46)
    - P. 5-4. [<span style="color: rgb(53, 152, 219);">Conduct HF assessments to support development of solutions and requirements</span>](#page_48)
- The Preliminary FAA HFC or supporting HF specialist also assists the Program Office in demonstrating compliance to the HF items in the <span style="color: rgb(53, 152, 219);">[In-Service Review (ISR) Checklist (FAA network user only)](https://fast.faa.gov/Resources/_leaving.cfm?ref=FAST&uri=https://my.faa.gov/org/linebusiness/ato/safety/isd.html)</span>

Additional useful information is provided on the pages listed below.

- <span style="color: rgb(0, 0, 0);">P. 5-5. [<span style="color: rgb(53, 152, 219);">HF Input to Preliminary Program Requirements Document</span>](#page_51)</span>
- <span style="color: rgb(0, 0, 0);">P. 5-6. [<span style="color: rgb(53, 152, 219);">Preliminary FAA Integrated HF Program (FAA IHFP)</span>](#page_58)</span>

See [<span style="color: rgb(53, 152, 219);">crdguidelines.pdf (faa.gov)</span>](https://fast.faa.gov/docs/crdguidelines.pdf) for additional details.

For relevant HF questions and associated documents to address during CRD, see [<span style="color: rgb(53, 152, 219);">HF AMS Lifecycle Checklist</span>](https://faa.switchboxinc.com/published/ams_lifecycle_checklist.xlsx).

[![chapter 5-1 picture.png](https://faa.switchboxinc.com/uploads/images/gallery/2023-08/scaled-1680-/chapter-5-1-picture.png)](https://faa.switchboxinc.com/uploads/images/gallery/2023-08/chapter-5-1-picture.png)