The phrase "ascertain the practice of" is correct and usable in written English.
It can be used when you want to determine or find out about a specific practice or method in a particular field or context.
Example: "The researchers aimed to ascertain the practice of sustainable farming techniques among local farmers."
Alternatives: "determine the method of" or "investigate the approach to".
The objective was to ascertain the practices and opinions of US maternal fetal medicine specialists regarding termination of pregnancy as a management option following late diagnosis of lethal fetal anomalies.
In the late 1960s there arose great interest in restoring not just Mozart's notes to their Ur condition but also his instruments and even (insofar as these could be ascertained) the performance practices of the musicians of his day.
These were used to ascertain how they affect the practice of farmer managed natural regeneration.
In the United Kingdom (UK), studies attempting to ascertain the prevalence of defensive practices have been extremely limited.
Unfortunately, data on the number of cultures taken during the study were not routinely collected to ascertain the impact of this aspect of clinical practice on case ascertainment.
This initiative should be monitored by a medical record review in a representative sample of death notifications to ascertain the veracity of certification and coding practices.
Their findings may help to achieve evidence-based practice on how to ascertain the quality of educational environment best and move the educational research field forward (Prideaux and Bligh 2002; Eva 2008; Eva and Lingard 2008; Bordage 2009).
Clinical trials should be performed to ascertain the effectiveness of this technique in clinical practice settings.
The purpose of the interviews was to ascertain the beliefs and current practices of GPs and practice nurses in relation to identifying and managing infants at risk of childhood obesity.
There follows one remaining, and quite extensive paragraph [XIV], which takes up the question how in practice one can ascertain the true motions of bodies and concludes: "But how we are to obtain the true motions from their causes, effects and apparent differences, and vice-versa, will be explained at length in the treatise that follows.
