Problem

Solution

Benefits Consequences

Context

Forces

Related patterns

Figure 1. A pattern is a problem-solution pair (adapted from Mowbray [7]).

«participates»

«participates»

Account AccountWrapper

OverdraftStrategy

Deduct FeeOverdraft Not Allowed

Strategy patternDecorator pattern

«participates»

«participates»

Figure 2. Two patterns in a banking system (adapted from [9]).