A synthesis reaction or direct combination reaction is one of the most common types of chemical reactions. In a synthesis reaction two or more chemical species combine to form a more complex product.
A design review is a milestone within a product development process whereby a design is evaluated against its requirements in order to verify the outcomes of previous activities and identify issues before committing to-and if need to be re-prioritise-further work.
This definition of life review process as postulated by Butler (1963) has several characteristics that should be highlighted. First, the process is described as a naturally occurring, universal mental process. In other words, it is a normal developmental task of old age.