You are designing an input screen for a client treatment data system which will be used by a county in your state. Alcohol and drug treatment providers will enter demographic and treatment data on their clients, then send it to the county Department of Behavioral Health. The system will run on a client/server network using a relational DBMS. Business rules require an entry for all data elements; there are no discretionary or optional fields. Data will include a mixture of alphanumeric data, numeric data used for calculations, and dates.

Some of the data fields will have interdependencies between them, such as a field for gender and another field for whether the client is pregnant.

Unique client identifiers will be used as keys and will be generated by the system.

Where should you design the data input controls and edits—at the client-side or server-side of the network? Why? What types of edits and validation checks should be included?