Global Data and Insights Team/Our Reports/2021 Affiliates data survey report/Glossary

Affiliate Data Survey Report 2021



The Affiliations Committee advises the Wikimedia Foundation Board of Trustees and makes recommendations regarding the recognition and existence of Wikimedia movement affiliates.


Incorporated or unincorporated independent open membership non-profit organizations recognized by the Affiliations Committee as working to support the international Wikimedia movement.

Affiliate capacity

An affiliate organization’s ability to conduct core functions that are required to achieve its mission. The affiliate leverages members time and skill as well as resources from partners, to build competence around an organization’s specific core function.


Board/Board Members

An elected group of individuals that has overall responsibility for the general management of a Wikimedia affiliate organization.


Community program

A well defined activity that creates opportunities for Wikimedia community members and movement partners to collaborate on as well as promoting Wikimedia projects both online and offline.

Community spaces

On-line or off-line opportunities for community members to congregate and collaborate.



A community program focused on partnering with Galleries, Libraries, Archives and Museums to facilitate release, documentation, and use of their content on Wikimedia projects.

Governance structure

Organizational infrastructure made up of management models, committees, leadership groups, and/or individual roles and responsibilities for leading an affiliate in setting policies, procedures, values, and long-term planning to meet the mission of the organization.


Institutional resilience

The affiliate organization’s ability to sustain its mission and operations despite potential changes to its governance, membership, or other social or physical assets.


Member/Membership depth

Individuals who join an affiliate organization with the intention of offering their participation, or support to the organization, often through volunteered time and skills, as official members. Membership depth represents the percentage of members that an affiliate organization can call on to assist with running programs and other activities compared with the total number of members enrolled.


Population frame

A list of all eligible members of a population from which samples are drawn. It can be thought of as the pool from which samples are obtained. [1]

Primary Contact

Persons whose role is to serve as official point of contact between a Wikimedia affiliate and external bodies, such as the Affiliations Committee, the Wikimedia Foundation, on behalf of the Wikimedia affiliate.


The probability of obtaining test results at least as extreme as the results that are actually observed. A p-value less than 0.05 is considered to be statistically significant for the purposes of this report.


Sampling unit

An individual unit selection for the purpose of sampling from a population. Each unit being regarded as individual and indivisible when the selection is made.[2]

Social climate

The perceptions of a social environment that is shared by a group of people.

Statistical distribution

An arrangement of values of a variable showing their observed or theoretical frequency of occurrence.

Statistical mean

The mean (or average) is the most popular and well known measure of central tendency. It can be used with both discrete and continuous data, although its use is most often with continuous data (see our Types of Variable guide for data types). The mean is equal to the sum of all the values in the data set divided by the number of values in the data set.[3]

Statistical significance

In research, statistical significance is a measure of the probability of the null hypothesis being true compared to the acceptable level of uncertainty regarding the true answer. A claim that a result is statistically significant based on testing or experimentation means it is not likely to occur randomly or by chance but is instead likely to be attributable to a specific cause. The p-value is commonly used as a test statistic to determine statistical significance.[4]


  1. (, nd), Sampling Framee
  2. (S. Glen. 2018), Statistics How To sampling-unit
  3. (Lund Research. 2018), Measures of Central Tendency
  4. (S. Tenny & I. Abdelgawad. 2021), Statistical Significance