Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A tuple space is an implementation of the associative memory paradigm for parallel/distributed computing. It provides a repository of tuples that can be accessed concurrently. As an illustrative example, consider that there are a group of processors that produce pieces of data and a group of processors that use the data. Producers post their data as tuples in the space, and the consumers then retrieve data from the space that match a certain pattern. This is also known as the Blackboard Metaphor. Tuple space may be thought as a form of distributed shared memory.