As random allocations are not particularly effective, there are two main forms of targeting:

A true experiment with random allocation of subjects to conditions allows researchers to infer causal relationships between different aspects of behavior and the environment.

They have ranged from the mad (random allocation of school places) to the inspired (Every Child Matters).

A randomized controlled trial was defined as a trial in which patients were assigned prospectively to one of two interventions by random allocation.

Lotteries were fast, but clearly a random allocation of licenses left much to be desired in terms of efficiency.

A special case of permuted-block randomization is random allocation, in which the entire sample is treated as one block.

Students are assigned to the various wards through a system of random allocation.

A random allocation of the treatments might give rise to the following:

The t treatments are applied within each block by random allocation to the experimental units.

Provided care is taken to achieve reasonable balance in the random allocation of communities, towns or districts to the waves, the resulting analysis can be straightforward.