We often notice the harmful consequences of decisions taken
individually (conflicts, contestation, etc.) that create insecurity and
instability in social and economic life in our countries. This is why
today in organizations and institutions, leaders have more and more
recourse to group decision-making where several individuals come
together to choose consensually an action or a sub-set of action among a set of actions knowing that each individual in the group has their
preferences and point of view.
In the scientific literature, there are many methods that allow
individual preferences to be aggregated into a collective preference
subject to consensus, but some have shortcomings and others require a
lot of calculations. In this article we propose a new simple method
based on the arithmetic mean and the absolute mean deviation to solve
group decision problems.

: arithmetic mean, absolute mean deviation, group decision