Henry Mintzberg (McGill University) identifies problems in trying to define what "strategy". A single definition is elusive and of dubious merit - instead he points out that the word "strategy" is used variously.
To avoid the latter Mintzberg basically says that we need to understand better our different uses of the same term. He suggests that we have five different uses of the term strategy. We take it to mean a plan, a ploy, a pattern, a position or a perspective - the 5Ps .
He then goes on to explore how strategy-making and its processes are expressed/manifested in these organisational types. For this he makes use of his own classification of organisational types.