Where should one look for a general summary of the research completed on "direct instruction"?

The answer to this question is: Journal of Educational Research
The Journal of Educational Research publishes researches manuscript in the field of education every years.
This journal had almost all acknowledged research within this field and they use general summary in order to attract potential readers upon a certain educational topic

Process costing is an accounting methodology that traces and accumulates direct costs, and allocates indirect costs of a manufacturing process. Costs are assigned to products, usually in a large batch, which might include an entire month's production.