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The Decider
Group Decision Making
Shiran Alush
Shai Kerer
Dor Altshuler
Academic instructor: Prof. Ronen Brafman
Contents

About the project

Main System Functionality

System Architecture

User Interface

Algorithms

Technologies
Problem Definition
Problem Domain : Group Decision Making

Few friends trying to decide where to go out on Friday night.

large organizations trying to set up a mass event like
student's-day or independence-day rally.

public opinion surveys etc.
What can you do?

Vote by hand raising/election (works only on simple decisions)

Argue until one takes the lead and decide for everyone (not fair)
What is “The Decider” ?
The Decider© is a new tool for supporting group
decision making. Users can define new decision
problems, vote for possible choices and
courses of action, and reach final decisions
using state-of-the-art voting algorithms.
The Decider© is an on-line Facebook application,
the biggest social network known today,
harnessing Facebook’s vast member's
community and its social managing tools &
features.
Main System Requirements

Create questionnaires

Cast your vote
with four types of possible
questions (Choose, Rank, Grade, Budget).
submit your opinions and Express other
preferences – For example: "I prefer a yellow Lamborghini
over a yellow BMW, but if I must get a white car then I prefer a
BMW over a Lamborghini".

Invite others
to participate in a questionnaire or join the
application.

Decide/View results -
Reach a decision in a fair way.
System Architecture
The System is an application
available as a web service via
Facebook at:
http://apps.facebook.com/the_decider
User Interface
Create a New
Questionnaire

General information.

Variables and possible
values.

Possible dependencies.

Constraints

Advanced settings.

Decision algorithms
Cast your Vote/
Express Preferences

Four types of questions.

Easy-to-understand
interface.

Express as many
different preferences as
you wish.

Submit your vote.
Calculate Results/ View Statistics

Edit settings.

View results

View statistics.

Delete.
Advanced options
(for advance users).

Invite your
Friends

Send your friends an
invitation to join the
application on Facebook.

Send your friends a
personal invitation to
cast their vote on a
specific questionnaire.
Decision Making Algorithms
Choose one Algorithms
•Plurality
•Plurality with run-off (two rounds)
Ranking Algorithms
•Borda count
•Condorcet
•Plurality with run-off
•Sequential run-off
•Extended Condorcet - Copeland
Score Algorithms
•Maximum sum
•Minimal regret
http://www.math.princeton.edu/math_alive/Voting/
Technologies
Any Questions?