Table A3

The structure of the major feedback loops

The structure of the major feedback loops
Order fulfillment at the vaccination site
VD + → VOR + → VOB + →VDD
VOB + → DSRV + → VSR + → VOFR − → VOB
TDD + → DSRV
TDD − → VOB
VOFR − → VDD
Inventory control at the Vaccination Site
VI + → MVSR − → VSR − → VICR
VMOPT − → MVSR − → VSR − → VI + → VICR
VSS + → DVI + →VIG
VMOPT + → DVI
EVD + → DVI + → VI + → VIG
VIAT +→ VIG
Order Placement
VTR + → VTDR + → VI + → VSR + → VICR
Production
DVO + → EVSD + → DP + → PRR + → WIPI + → PCR + → MI + → MSR
WIPI + → DWIP + →WIPG − → PRR
MLT + → DWIP + → WIPG − → PRR + → WIPI
Closed Loop
VUD − → UV + → UVD + → UDV or VUD − → UV+ → VCR+ → CV
Collection
CC + → VCR + →CV
CV + → VRFR − → CV
CV + → VAR − → CV
FP − → VAR
FP + → VRFR
Remanufacturing
VRFR +→ DV
VAR + → RV + → CVD
VAR + → RV +→ VRR + → ERR + → RR
Transshipment
DVO + → VSOR + → AIL + → AI + → VTR + → VC
MDBV + → TLT + → VUD −→ VTR +→ VC
MDBV + → VTR
AFR+→ AR
Vehicle capacity
VC + → NAV − → VUT + → NAV
DNV + → VC and ACV + → VC
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