Duplicate Management

PCH-SIG automatically detects potential duplicates between households to ensure registry integrity.

Access

Side menu: Social Registry > Duplicates

Required permission: registre.doublons_view

Types of detected duplicates

The system identifies several types of duplicates:

Type	Description	Example
Phone	Same phone number	2 households with phone 771234567
Name + Locality	Same name in the same locality	"Mamadou Diop" x2 in Thies
Mobile Money	Same Mobile Money number	2 households with MM 771234567
GPS coordinates	Identical geographic position	Same latitude/longitude

Risk level

Each detected duplicate has a risk level:

Level	Score	Description
High	80-100	High probability of real duplicate
Medium	50-79	Possible duplicate, verification needed
Low	< 50	Similarity detected but probably distinct

The score is calculated based on the number of matching fields and their importance.

Management interface

Overview

The page displays statistics:

• Detected: Total number of duplicates
• Untreated: Awaiting action
• Confirmed: Marked as true duplicates
• Ignored: Marked as false positives
• Merged: Merged households

Duplicate list

Each duplicate shows:

• Duplicate type (icon)
• The 2 households concerned
• Similarity score
• Treatment status
• Detection date

Filters

Filter	Options
Status	All, Untreated, Confirmed, Ignored, Merged
Type	Phone, Name, Mobile Money, GPS
Risk level	High, Medium, Low

Examine a duplicate

Click on a duplicate to see details:

Side-by-side comparison

Field	Household A	Household B
Code	MEN-2024-001	MEN-2024-089
Head	Mamadou Diop	Mamadou Diop
Phone	771234567	771234567
Locality	Thies	Thies
Size	5	5
Collection date	01/15/2024	03/20/2024

Identical fields are highlighted.

Actions on a duplicate

Ignore

If it is not a real duplicate (false positive):

1. Click on Ignore
2. Add an explanatory comment (optional)
3. Confirm

The duplicate is marked as ignored and no longer appears in the untreated list.

Required permission: registre.doublons_check

Confirm

If it is a real duplicate:

1. Click on Confirm
2. Add a comment
3. The duplicate is marked for merging

Merge

To merge two households into one:

1. Click on Merge
2. Choose the main household (which will be kept)
3. Verify the information that will be merged
4. Confirm

The merge:

• Keeps the main household
• Transfers members from the other household
• Transfers associated payments and beneficiaries
• Archives the deleted household

Required permission: registre.doublons_merge

Warning

Merging is irreversible. Verify carefully before confirming.

Manual verification

To launch a duplicate verification:

1. Click on Check duplicates
2. The verification runs in the background
3. Newly detected duplicates appear in the list

Verification can be scheduled automatically by the administrator.

Best practices

Prevent duplicates

• Check if the household exists before creating it
• Use phone search
• Validate GPS data in the field

Treat duplicates

• Treat high-risk duplicates as a priority
• Document decisions with comments
• Contact the field in case of doubt

Merging

• Always choose the household with the most recent/complete data
• Check associated payments before merging
• Inform field teams about the merge