# 07 — Stated Assumptions

Living ledger. Items move to Confirmed/Retired as the customer answers Q-NNNs.

## Active assumptions

| ID | Assumption | Rationale | Impact if wrong | Status |
|----|------------|-----------|-----------------|--------|
| A-001 | Project is greenfield (new construction) | Construction Bulletin status; absence of existing-system inventory | ±30% (rehab adds demolition + cutover + after-hours work) | Open — Q-018 |
| A-002 | BMS scope follows Megaworld MC Standards points list (ME + PL) for the in-scope systems; project-specific BMS-01..04 sheets are schematic confirmation | MC Standards is the readable text source; project sheets are mostly raster and stamp-confirmed | ±10% if scope sub-setted | Open — Q-001 |
| A-003 | Open BACnet/IP head-end, BACnet MS/TP and Modbus RTU at field; Siemens Desigo CC and PXC family | Default brand standard; no customer override | ±15% material if customer prefers another tier-1 | Open — Q-013 |
| A-004 | Isolated BMS LAN with single uplink to customer LAN | Standard hospitality assumption; no customer IT spec provided | Minor; +cost only if redundant uplinks required | Open |
| A-005 | Guestroom-corridor FCU control points at typical density (3 sample floors × ~30 FCU/floor) — included in BMS scope | Cover letter silent; standard hospitality assumption | +20–30% if every guestroom included; -10% if owner-package | Open — Q-005 |
| A-006 | Standard PH commercial terms — PHP currency, 12% VAT, 60–90 day validity, milestone-based payment | No commercial terms provided | Minor unless customer dictates retention >10% | Open — Q-014 |
| A-007 | FDAS / PMS / CCTV / ACS integration not in base scope; offered as Option | Cover letter silent | +PHP 200–500K each per integration | Open — Q-012 |
| A-008 | Network architecture: 1 core 24-port + 4 SFP + edge 8/16-port switches per riser; OM3 fiber riser; 6 IDF closets | Standard medium-tier hotel topology; deferred to A5 | ±5% on network material | Open |
| A-009 | Schedule: 16 weeks PO → handover (mobilization wk 1, FAT wk 5, install wk 7–13, T&C wk 13–16) | Customer schedule absent; standard greenfield medium tier | +20–30% on PM if shorter required | Open — Q-007 |
| A-010 | Day-shift work, no after-hours premium | Greenfield; no occupied phase | +10–20% labor if night work required | Open |
| A-011 | Cable jacket: FRLS per PH BFP code (hospitality, fire-rated spaces) | PH jurisdiction; standard for hospitality | Minor | Open |
| A-012 | EE Plan and BMS sheets are construction-stage but mostly raster; scale not recoverable from pdftotext extraction. Cable lengths use reasoned typical-ranges (`A3-route-lengths.yaml.typical_ranges:`) — measurement deferred to shop-drawing stage. Triage acknowledges drawings are present but not pixel-measurable in this run. | Per measure-cable-routes sub-routine fallback rule (3) "Scale unrecoverable" | ±15% on cable BOQ; refines at shop-drawing review | Open — Q-005 |
| A-013 | Operator training: 16 hours over 2 days, up to 6 operators | Standard for hospitality | Minor; Q-015 confirms exact ask | Open — Q-015 |
| A-014 | Maintenance contract not in base scope; offered as Option (1-year PM) | Standard for proposal scope | — | Open — Q-016 |
| A-015 | Trend-log strategy: hospitality standard — 100% AI/AO/DO, 30% DI, 70% HLI. Reasoned in `B1-trend-strategy.yaml` | Hospitality is comfort/energy-driven, not regulated like healthcare/casino; status DIs are abundant but rarely useful as trends | Minor | Open |
| A-016 | I/O module spare strategy: 25% AI, 25% AO, 15% DI, 15% DO. Reasoned in `A3-cable-spec-rules.yaml.spare_strategy` | Mature design (Construction Bulletin status) but field counts likely to firm during shop-drawing; AI/AO higher reserve for control-loop tuning | Minor | Open |
| A-017 | Conduit fraction = 35% of total cable. Greenfield with co-installation in ME-supplied tray for the trunk; BMS-installed conduit on field-device drops. | Reasoned in `B4-site-factors.yaml.conduit_fraction_basis` | ±2% on labor BOQ | Open |
| A-018 | Production-rate modifier 1.0× (greenfield, day-shift, unoccupied site) | Standard greenfield site condition | ±10–20% if night work needed | Open |
| A-019 | Commercial: overhead-and-margin 18%, contingency 6%, VAT 12%. Reasoned in `06-commercial-rates.yaml` — greenfield clear-scope, drawings stable, low scope risk warrants tighter contingency than the 7.5% legacy default | Risk register low; Construction Bulletin = mature design | ±2–3% on grand total | Open |

## Retired assumptions

(None — first run.)