
Figure 1
Number of References by Category

Figure 2
Number of Sources in Which Categories Are Referenced.
Table 1
Categories & Topics / Sub-topics by Author-Supplied Keywords (Condensed).
| Themes | Topics | Subtopics | Files | References |
|---|---|---|---|---|
| All Themes | 38 | 89,622 | ||
| Teaching & Learning | 38 | 24,997 | ||
| Learning | 38 | 9,418 | ||
| Student | 38 | 2,649 | ||
| Literacy | 33 | 308 | ||
| Teaching | 38 | 15,271 | ||
| Instruction | 38 | 7,336 | ||
| Administration | Administration | 38 | 24,265 | |
| Schools, Courses, Programs | 38 | 1,071 | ||
| Courses, Programs | 38 | 1,773 | ||
| Schools | 38 | 5,787 | ||
| Practice | 38 | 1,042 | ||
| Policy | 38 | 24,265 | ||
| Management | 38 | 1,071 | ||
| Professional | 38 | 1,773 | ||
| Access | Access | 38 | 11,581 | |
| Search | 38 | 10,629 | ||
| Research | 38 | 10,270 | ||
| Analysis | 38 | 3,694 | ||
| Information | 38 | 3,460 | ||
| Resources | Resources | 38 | 7,593 | |
| Material | 38 | 3,320 | ||
| Text | 21 | 1,221 | ||
| Development | Development | 38 | 5,921 | |
| Growth | 38 | 2,187 | ||
| Model | 38 | 1,663 | ||
| Adoption & Integration^^ | 38 | 3,713 | ||
| Adoption ^^ | 38 | 2,334 | ||
| Integrate | 38 | 773 | ||
| Support ^^ | 38 | 606 | ||
| Quality | Quality | 38 | 3,742 | |
| Defining Characteristics of OER | 38 | 3095 | ||
| 4Rs; 5Rs | 38 | 1,660 | ||
| Share | 38 | 1,435 | ||
| Technology | 38 | 2,784 | ||
| Khan Academy | Khan Academy | 12 | 1,021 | |
| Cost, Expense | 37 | 910 |
Table 2
Article Types and Research Method
| Type | # of Sources |
|---|---|
| Theoretical & Philosophical | 10 |
| Combined methods | 8 |
| Descriptive analysis | 7 |
| Inferential analysis | 6 |
| Interpretative analysis | 3 |
| Content & discourse analysis | 2 |
| Other | 2 |

Figure 3
Number of sources by research method
Table 3
Sources by Discipline
| Discipline | # of Sources | ||
|---|---|---|---|
| Humanities | 1 | ||
| The Arts (Literature) | 1 | ||
| Professional & Applied Sciences | 37 | ||
| Education | 36 | ||
| Distance Education (includes Distributed Learning) | 12 | ||
| Educational Technology | 4 | ||
| Open Education | 18 | ||
| Science Education | 2 | ||
| Library & Museum Studies | 1 | ||

Figure 4
Number of Articles published in Open vs. Non-Open Journals

Figure 5
Study Articles Cited by Others
