The phrase "employed different methods" is correct and can be used in written English.
You may use this phrase any time you want to indicate that a particular entity used multiple approaches to reach a desired result or outcome. For example: "The marketing department employed different methods to boost their online presence."
However, the results are difficult to compare, because the researchers have employed different methods and have used differing categories to distinguish ethnic affiliation.
Other companies have employed different methods, like using gas lasers, to generate the colors.
Load sensors have employed different methods, such as the use of strain gauges [[1],[2]], piezoelectric vibration [[3],[4]], and capacitance changes [[5]].
Such studies have employed different methods, including degree centrality, clustering coefficient, degree distribution, closeness centrality, shortest path length, and community structure.
Although there is a lack of facilities and reliable techniques for preparing high-quality nanometer-sized particles, researchers have employed different methods using chemical or electrochemical, electrospinning interfacial and microwave polymerization [19, 25, 26, 27, 28].
As artificial intelligence became popular in the 1980s, a new approach was introduced for construction cost estimation, while several studies employed different methods to estimate the costs in a wide range of industrial applications.
Significant differences were found between studies employing different methods in rocky reefs and outliers were not used in assemblage characterisation.
As a consequence, scientists in different periods of normal science generally employ different methods and standards, experience the world differently via "theory laden" perceptions, and most importantly for Kuhn (1983), differ with respect to the very meanings of their terms.
When different studies employ different methods in analyzing raw data this can cause unwanted (study-dependent) differences on the normalized data.
The antidoping squads at the Tour de France are also employing different methods.
There are now further fears that terrorists might employ different methods, now that security has been tightened.
