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📄 Red Witch – Design Input: Modular Calendar Overlays

Document Name: Calendar Overlays System for Fertility & Cultural Frameworks Document Type: Internal Design Input / Architecture Specification Purpose: Define a modular system that allows users to apply fertility awareness methods (FAM) and cultural/alternative frameworks as “overlays” on the base Red Witch cycle calendar. Supports inclusivity, personalization, and scalability while preserving privacy-first principles.

1. Summary

Red Witch shall implement a Calendar Overlays architecture, enabling multiple frameworks to interpret the same core cycle data.

Core calendar = neutral log of dates, symptoms, biomarkers.
Overlays = interpretation layers (fertility frameworks, cultural calendars, spiritual systems).
User control = toggle overlays on/off like map layers.

This model allows both evidence-based fertility awareness methods (e.g., Billings, Symptothermal) and cultural/spiritual approaches (e.g., lunar, Wiccan) to coexist in one platform, without bias or data duplication.

2. Overlays Supported

2.1 Fertility Awareness Method (FAM) Overlays

Billings Ovulation Method (BOM): cervical mucus interpretation.
Symptothermal Method (STM): combines basal body temperature + mucus + cervical position.
Creighton Model: standardized mucus charting with symbols.
Standard Days Method (SDM): fixed fertile window overlay.
TwoDay Method: simple yes/no mucus-based overlay.
Marquette Method: adds hormonal testing (if user integrates test results).

2.2 Cultural & Alternative Overlays

Wiccan / Pagan Calendar: lunar phases, sabbats, ritual cycles.
Lunar/Astrological Cycles: moon phases, zodiac tracking.
Ayurvedic / TCM Cycles: holistic cycle interpretations (doshas, qi flow).
Other cultural frameworks as suggested by user research and PMS findings.

3. Technical Requirements

Requirement ID	Requirement	Notes
CO-001	Core cycle data shall be stored once and interpreted by overlays without duplication.	Ensures data efficiency and privacy.
CO-002	Users shall be able to enable/disable overlays independently.	“Layer toggle” menu in calendar UI.
CO-003	Overlays shall display transparent layers on top of the core calendar.	Similar to map layers.
CO-004	Each overlay shall include a legend, explanation, and risk disclaimer.	Regulatory compliance, user clarity.
CO-005	Overlays shall be modular and extensible, so new frameworks can be added in updates.	Supports scalability.
CO-006	Overlays shall not alter raw user data; only interpret it.	Preserves integrity of user logs.
CO-007	Fertility method overlays (e.g., STM, BOM) shall clearly state whether they are validated medical methods or wellness tools.	Distinguishes regulated vs. non-regulated use.

4. Risk & Compliance Considerations

Risk ID	Risk Description	Mitigation
R-CO-001	Users may confuse wellness overlays with medical contraceptive tools.	Clear disclaimers; education; informed consent.
R-CO-002	Overlays may not be culturally appropriate in all contexts.	Allow opt-in only; no defaults.
R-CO-003	Incorrect overlay interpretation could cause unintended pregnancy.	Education, user manual, and warnings.
R-CO-004	Overlays add complexity for low-literacy or young users.	Age-appropriate defaults; ability to hide overlays.

5. Usage

This design input informs:

SRS: Add requirements for modular overlay architecture.
RMF: Add overlay-specific risks (e.g., misinterpretation, inappropriate use).
QMS Evidence: Demonstrates inclusive, extensible design aligned with PMS findings and user personas.

6. Notes

Implementation should use the same mechanism for both FAM and cultural overlays (single “layering” system).
Overlays should be future-proof: easy to add methods or cultural calendars through modular updates.
Transparent separation between data (raw logs) and interpretation (overlays) is critical for user trust and regulatory compliance.

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