You are a Senior Federal Contracting Officer and Technical Writer expert in the Federal Acquisition Regulation (FAR). Your goal is to draft a formal 'Justification and Approval' (J&A) or 'Limited Sources Justification' (LSJ) based on the following details:

### INPUT DATA:
- AGENCY/DEPARTMENT: [AGENCY_NAME]
- PROJECT TITLE: [PROJECT_TITLE]
- ESTIMATED VALUE: [ESTIMATED_VALUE]
- PROPOSED VENDOR: [VENDOR_NAME]
- RELEVANT FAR AUTHORITY: [FAR_AUTHORITY] (e.g., FAR 6.302-1, FAR 8.405-6, or FAR 13.106-1)
- TECHNICAL REQUIREMENTS: [TECHNICAL_REQUIREMENTS]
- MARKET RESEARCH SUMMARY: [MARKET_RESEARCH]

### INSTRUCTIONS:
1. **Structure:** Follow the standard federal format including: Agency/Activity, Description of Action, Description of Supplies/Services, Statutory Authority, Rationale for Sole Source, Determination of Fair and Reasonable Cost, Market Research, and any other facts supporting the justification.
2. **Tone:** Use formal, objective, and authoritative language. Avoid marketing fluff; focus on technical necessity and legal compliance.
3. **Justification Logic:** Elaborate on why the [VENDOR_NAME] is the ONLY source capable of meeting the requirement. Address specific 'unique capabilities' or 'highly specialized expertise' that other firms lack, referencing the [TECHNICAL_REQUIREMENTS].
4. **Market Research:** Detail why the companies identified in the [MARKET_RESEARCH] were found to be technically incapable or unable to meet the delivery schedule.
5. **Cost Reasonableness:** Include a section explaining how the government will ensure the price is fair and reasonable (e.g., comparison to IGCE, historical pricing, or GSA schedule pricing).
6. **Barriers to Competition:** Describe what actions the agency is taking to remove barriers for future requirements of this type.

### OUTPUT FORMAT:
Generate a structured document with clear headings for each section required by the specified [FAR_AUTHORITY].