The phrase "a critical theme" is correct and usable in written English.
It can be used when discussing an important or significant idea or concept within a text, artwork, or discussion.
Example: "In her novel, the author explores a critical theme of identity and self-discovery."
Alternatives: "an essential theme" or "a key theme".
Citing the killings of four Israeli settlers in the West Bank this week, Mr. Netanyahu said security would have to be a critical theme of the talks.
"A critical theme that emerged throughout our inquiry was the difficulty of answering the question: Who is in charge?" said Lee H. Hamilton, the panel's vice chairman and a former Democratic House member from Indiana.
The accuracy and metrology traceability of DNA quantification is becoming a critical theme in many fields, including diagnosis, forensic analysis, microorganism detection etc.
Horizontal integration is poised to become a critical theme in the West as the value of North American tech IPOs reached a three-year low during Q1 2016.
With respect to theorizing about gendered violence, the possibility of separating the public from the private sphere is a critical theme.
Through the inductive analysis, a critical theme emerged where Makers from different educational backgrounds and with different careers (e.g., art, STEM, business) were making artifacts that had a similar purpose (see Table 8).
It's a familiar critical theme that Steven Soderbergh's movies are obsessed with process, with the realization of an idea, and that theme isn't just in his movies, it's the way he thinks, as seen in a speech he gave last Saturday at the San Francisco International Film Festival — its annual State of Cinema Address — that none of us were meant to see.
The development of social networks, both inter-personal, expressed through champions and advocates, and inter-organisational, was an additional critical theme, while both the immediate organisational context and the wider socio-political and economic environment were recurrently articulated as major influencing factors.
A central and critical theme was that of experience.
It shares a critical underlying theme with the Scarman report into the Brixton riots of 1981 and the murder of Stephen Lawrence on the other side of south London in the early 1990s.
The critical theme of the new design is the shifting downward of air handling areas.
