A Clearly Stated Position
By definition, an argument requires the existence of a debatable issue. In other words, for an argument to even take place there must be at least two sides. When two or more arguable positions exist, each constitutes part of the context.
The audience-those to whom your position will be argued-constitute another part of the context. And since it will contain both supporters and detractors, it is essential that your position be clearly stated. It is the foundation upon which each brick of your evidence will be stacked and must be strong enough to bear its own weight as well as the onslaught of opposing arguments.