## 4 Results
### Two Major Requirements Cross Nearly All Librarian Positions  
Besides the years of work experience, another most common requirements specified in the ALA Joblist ads is the terminal degree. As shown in Figure 10, 87.46% of the advertised positions require a master's degree. Specifically, an ALA-accredited masters is often stated as a required or preferred qualification in the job description. However, this particular degree requirement may have some exceptions when considering the whole job market. For example, among 6 current job positions posted on the official homepage of MIT Library [21], only 2 of them require a master's degree, while 4 of them require a minimum degree of bachelor. Employers may not be willing to post positions with lower degree requirements on ALA Joblist.  
While work experience is another major job requirement, management positions have a higher limitation in length of work experience than positions providing specific services. As Figure 11 shows, except for those without specified experience requirements (39.61%), only a few job positions accept applicants with work experience of less than 2 year (10.77%). Of special note is the experience requirement in relationship to job type. Positions of director want more experienced librarians. Among 530 job ads titled \"Library Director\", there are 418 of them demanding 5 or more years of work experience. On the other hand, positions providing specific services (\"Electronic Resources Librarian\",  
\begin{table}
\begin{tabular}{l|c|c} \hline \hline
**Job Position Cluster** & **Frequency** & **Samples** \\ \hline Director & 1209 & Library Director; Head Librarian; Dean of Libraries \\ Public Service Librarian & 323 & Director of Library Services; Public Services Librarian \\ Reference \& Instruction Librarian & 282 & Reference \& Instruction Librarian \\ Technical Services Librarian & 132 & Head of Technical Services; Technical Services Librarian \\ Electronic Resources Librarian & 92 & Electronic Resources Librarian \\ \hline \hline \end{tabular}
\end{table}
Table 6: Top 5 job positions clusters with maximum frequency.  
\begin{table}
\begin{tabular}{l|c|c} \hline \hline
**Job Title** & **Frequency** & **Percentage** \\ \hline Library Director & 530 & 18.73\% \\ Director & 105 & 3.71\% \\ Executive Director & 101 & 3.57\% \\ Director of Library Services & 66 & 2.33\% \\ University Librarian & 34 & 1.20\% \\ Director of Libraries & 33 & 1.17\% \\ Head Librarian & 25 & 0.88\% \\ Library Manager & 24 & 0.85\% \\ Dean of Libraries & 24 & 0.85\% \\ Director of the Library & 23 & 0.81\% \\ Dean of the Library & 19 & 0.67\% \\ City Librarian & 18 & 0.64\% \\ University Archivist & 15 & 0.53\% \\ Dean of Library Services & 16 & 0.57\% \\ Dean of University Libraries & 15 & 0.53\% \\ Director of Library & 14 & 0.49\% \\ Managing Librarian & 9 & 0.32\% \\ County Librarian & 9 & 0.32\% \\ Library Administrator & 8 & 0.28\% \\ Director, Library Services & 8 & 0.28\% \\ Library Services Director & 8 & 0.28\% \\ Manager of Library Operations I & 7 & 0.25\% \\ Director of Library and Information Services & 7 & 0.25\% \\ Chief Executive Officer & 6 & 0.21\% \\ Chief Librarian & 5 & 0.18\% \\ Total & 1129 & 39.91\% \\ \hline \hline \end{tabular}
\end{table}
Table 5: Library administration positions.  
\"Reference Librarian\", \"Youth Services Librarian\" and \"Systems Librarian\", e.g.) are more likely to demand work experience of 2-5 years.