"determining the effectiveness" is correct and perfectly usable in written English.
You can use it when you want to refer to the act of assessing the results or impact of a certain action, policy, or process. For example, "The team is still in the process of determining the effectiveness of the new marketing strategy."
Determining the effectiveness of those ads was hard.
May said management and leadership was more important in determining the effectiveness of a police force than the absolute number of officers.
Researchers, for instance, cannot compile data about patients' longer term results — information that is critical in determining the effectiveness and reliability of defibrillators.
Dr. Murphy has not developed an experimental SARS vaccine but the neutralizing antibody he found in his experiments provide an important measure for determining the effectiveness of experimental SARS vaccines, Dr. Fauci said.
Nor need they necessarily incorporate into their regimen Ferriss's method for determining the effectiveness of controlled binge eating: weighing his feces to find out exactly what kind of shit he was full of.
I shall only say that this seems to me a highly limiting methodology for determining the effectiveness of a stabbing machine.
The ability to assess recreational harvest is important for determining the effectiveness of AR deployments.
Evaluating a strategy requires determining the effectiveness of each step or tactic.
Hence, it can be implied that the proposed PPM system remains stable in determining the effectiveness of the CSP.
The assignment of computations to processors is a crucial factor determining the effectiveness of a parallel algorithm.
Water flow-assisted motion of the plastics was captured and its role in determining the effectiveness of separation was described.
