 < Treforest Conference Facilities

## Introduction

Each candidate sitting GCE A/AS, GCSE Modular and Key Skills examinations will be allocated a Unique Candidate Identifier (UCI) number, which will be used to identify individuals during their modular courses.

Modular 'cash-in' entries often include results from more than one examinations session. It is necessary to be able to track individual candidates' module results to ensure that the correct 'cash-in' grade is awarded. Whereas a candidate number is only valid for a single session, a UCI will remain with individuals for the duration of their GCE courses, even if the candidate moves to a different centre.

UCIs are also required for Key Skills and the new GCSE Modular specifications.

## UCI structure

The UCI is a 13-character code made up as follows-

68199 0 01 2058 G

 Digits 1-5 the centre number where the candidate enters his / her first unit Digit 6 Board identifier (0 in all cases for WJEC entries) Digits 7-8 year in which the UCI is generated Digits 9-12 the four digit candidate examination number Digit 13 Check digit calculated / allocated automatically

## Online check digit generator

This programme will calculate the check digit for a given UCI.

 Centre Number UAB identifier (always 0) Year of Registration Candidate Number Check Character

## Calculating the check digit

The check digit is calculated from the first twelve digits as follows:

 Digit ID ID1 ID2 ID3 ID4 ID5 ID6 ID7 ID8 ID9 ID10 ID11 ID12 check Digit value 6 8 9 9 9 0 9 8 0 0 0 1 ? Multiply by 16 15 14 13 12 11 10 9 8 7 6 5

ID1 is multiplied by 16, ID2 is multiplied by 15, ID3 by 14 etc, and the sum of the products calculated.

So for UCI 689990980001
(6×16) + (8×15) + (9×14) + (9×13) + (9×12) + (0×11) + (9×10) + (8×9) + (0×8) + (0×7) + (0×6) + (5×5) = 734

The sum of the products is then divided by 17, and the remainder calculated.

734÷17 = 43; remainder = 3

The letter corresponding to the value of the remainder in the table below is the check digit

 Remainder 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Check Digit A B C D E F G H K L M R T V W X Y

For the example above, the check digit is D
The complete UCI is therefore 689990980001D