Advantages
1. The design is extremely easy to construct.
2. The design is easy to analyze even though the sample sizes
might not be the same for each treatment.
3. The design can be used for any number of treatments.
Disadvantages
1. Although the completely randomized design can be used for
any number of treatments, it is best suited for situations in
which there are relatively few treatments.
2. The experimental units to which treatments are applied must
be as homogeneous as possible. Any extraneous sources of
variability will tend to inflate the error term, making it more
difficult to detect differences among the treatment means.