'call for improvement' is a correct and usable phrase in written English.
You can use it when you want to express that something needs to be improved. Example: Tim's work was good, but still needed some tweaking; his supervisor issued a call for improvement.
The Government is entirely right to strengthen the independent regulator, as it is to call for improvement in the calibre of charitable trustees.
Consensus statements have issued a call for improvement of coronary CT angiography's knowledge base.
Facebook employees should know that the public wants progress urgently, and while it might not understand all the complexities and sometimes makes its criticism personal, it's still warranted to call for improvement.
In fact, even if at the moment it may call for improvement, the level of performance the system is showing can currently benefit applications such as complementing the ASR of a service robot serving as a waiter in a restaurant [23], or in the analysis of the acoustic scene of a cocktail party, or in the design of hearing aids.
These findings call for improvement on the services provided.
The findings call for improvement in mental health care service delivery to individuals with schizophrenia.
They also call for improvements to mental health services, funding to help improve school climate and strings on federal money to ensure that each school has an emergency safety plan.
Many will call for improvements in the efficiency of student aid programs.
The conference is to call for improvements in setting and marking exams, a larger and better trained pool of markers, and a transparent appeals process.
Dr Penny Woods, chief executive of the British Lung Foundation, said the report made an important call for improvements in early diagnosis.
In June, the U.S. National Institutes of Health issued a call for improvements in the biographical sketch that it requires grant applicants to submit.
