Life scientists have been reported as the most ready to share research data \cite{Jones_2019} \cite{Grant_2018}, and early career researchers in particular may have been trained and be ready and enthusiastic about sharing data \cite{Sholler_2019} \cite{Campbell_2019}. But even in disciplines where sharing research data can be tied-up with complex issues like personal data privacy and consent there is recognition of the imperative to share research data \cite{Taichman_2017}
Publishers and journals are among the parties that play an important enabling role; when they ask or require researchers to include data availability statements in their articles they help communicate and explain expectations, and they help researchers to meet data-sharing requirements  \citet{Wu_2019}. They help researchers "to plan for the longevity, reusability, and stability of the data"     
Data availability statements published within journal articles enable researchers to describe whether and how the research data can be accessed, and the conditions under which it can be accessed. When research authors have shared data in appropriate research data repositories, data availability statements use permanent identifiers to link between the journal article and the data.  
Data sharing preferences among researchers continue to be widely surveyed, including by Wiley \citep{wiley2017}. Surveys about data sharing show reported behaviours, intentions, and aspirations \cite{Fecher_2015}. Actual data sharing behaviours can be and have been investigated by looking at data availability statements published in journal articles, to assess the impact and effectiveness of data sharing policies at journals \cite{Federer_2018} \cite{Stall_2019} \cite{Hardwicke_2018}. Studies of the impact of their data-sharing policy changes have concluded that data sharing practices among researchers are changing but fall short of what seem to be, based on the rhetoric, the study authors' expectations \cite{Wallach_2018} \cite{Federer_2018} \cite{Rowhani_Farid_2016}. This tells us about the importance of setting reasonable expectations at publishers and journals and supporting those with robust policy and process, and suggests how fair and implementable policies can be designed and might be successful. It also tells about the pace of change in different communities of researchers as they become familiar with, interested in, able to, and required to share research data.