Feedforward control focuses on the regulation of inputs (human, material, and financial resources that flow into the organization) to ensure that they meet the standards necessary for the transformation process.
Feedforward controls are desirable because they allow management to prevent problems rather than having to cure them later. Unfortunately, these control require timely and accurate information that is often difficult to develop. Feedforward control also is sometimes called preliminary control, precontrol, preventive control, or steering control.
However, some authors use term "steering control" as separate types of control. This types of controls are designed to detect deviation some standard or goal to allow correction to be made before a particular sequence of actions is completed.
Concurrent control takes place while an activity is in progress. It involves the regulation of ongoing activities that are part of transformation process to ensure that they conform to organizational standards. Concurrent control is designed to ensure that employee work activities produce the correct results.
Since concurrent control involves regulating ongoing tasks, it requires a through understanding of the specific tasks involved and their relationship to the desired and product.
Concurrent control sometimes is called screening or yes-no control, because it often involves checkpoints at which determinations are made about whether to continue progress, take corrective action, or stop work altogether on products or services.