Standards-Based Grading Converter

Help me convert this traditionally graded assignment to a
standards-based grading approach.

Current assignment: [DESCRIBE THE ASSIGNMENT]
Current grading: [HOW IT'S CURRENTLY SCORED, e.g., POINTS,
PERCENTAGE, LETTER GRADE]
Standards addressed: [LIST SPECIFIC STANDARDS]

Create:
1. Separate learning targets for each standard assessed
2. A proficiency scale for each target (4 levels: Beginning,
   Developing, Proficient, Advanced)
3. Clear descriptions of what evidence demonstrates each level
4. How to report a standards-based grade from this single
   assignment
5. How this fits into a larger body of evidence for the standard
6. Guidance on reassessment -- what would a student need to show
   to move up a level?

Also address:
- How to handle students who show mixed proficiency across
  standards within one assignment
- How to communicate this grading approach to parents
- How to convert to a traditional grade if required by the school
  system

Grading system context: [SCHOOL'S CURRENT SYSTEM AND ANY
REQUIREMENTS]