The following are basic terms and concepts associated with the Surveda. 

Channel: A communication channel, or simply channel, refers to the connection made with a mobile network operator (MNO) or aggregator to send out SMS messages or phone calls. A channel is always associated with a single phone number.

Cutoff Rules: Are included in the tool as an option to address non-response sample size adjustments. Based on the required sample size, Surveda can halt the survey administration.  If you don't select any, the survey will be sent to all respondents.

Experiment: A comparison of two scenarios to evaluate success (i.e., response rate, data quality, etc.).

Incentive: A token of appreciation provided to a survey respondent for completing a questionnaire.

Fallback: A secondary mode of communication that will be implemented if the primary is not successful in reaching the user. 

Mode: A way or manner in which a survey is delivered or is experienced by a respondent (e.g., SMS, IVR, mobile web, etc.). Each mode has unique advantages and disadvantages researchers should consider before selecting the best format to implement a survey.

Project: A collection of surveys and questionnaires to which a group of users have access.

Questionnaire: A flow of questions, response options, and logic, with the supporting content text and audio messages to be sent to potential respondents.

Quotas: The minimum number of completed results for specific categories such as age or gender.

Respondent: An individual from the sample that participates in the survey, answering at least one question from the questionnaire. 

Sample: A list of mobile phone numbers used to select respondents to participate in the survey. 

SMS: Short Message Service, a text messaging service component of most telephone and mobile telephony systems.

Survey:  The administration of a questionnaire using mobile phone numbers in order to collect data.