Scalability of Survey Solutions

The Survey Solutions supports horizontal scaling and may be deployed as a web-farm for servicing a large number of client connections. This is especially important for operations like population censuses and large national surveys. A web-farm installation is implemented on multiple systems (called nodes) working in concert to service the received requests. Increasing the number of nodes in the farm allows to improve the overall performance: the responsiveness of the system and number of users working simultaneously.

August 7, 2019

What tablets should I buy?

Technical Requirements Survey Solutions software works with Android tablets with the following specifications: Version of Android OS: Android 5.0 or better is required, Survey Solutions will not work at all on tablets below Android 5.0. tablets on Android 5.0.1 and 5.0.2 are known to have communication problems with some SSL certificates; tablets with versions of Android below 6.0 may be not displaying all characters of the current Unicode standard; all versions of Android below 8.

June 5, 2019

Server Requirements

Server requirements are periodically revised. The characteristics below are outlined for a survey of no more than 100,000 interviews. Contact support for a consultation if: your survey is larger, or you plan to host several surveys, or if you plan to collect any multimedia data (photos, audio recordings, etc), or there are other non-standard circumstances. Requirements for the server depend on the use and the type of the survey.

March 15, 2019

Date and Time formats

This document uses the following notation to describe the date and time formats: Y - year M - month D - day h - hour m - minute s - second T - exactly letter T {AM|PM} - one of the two time specifications AM or PM. Mon - month abbreviated to 3 letters Month - full month name. DOW - day of week (such as Monday, Tuesday, etc). TZ - timezone Exported data Survey Solutions writes date and time as strings in exported data files.

June 27, 2018

How to cite Survey Solutions in a publication?

The suggested citation for Survey Solutions is: The World Bank, 2018 Survey Solutions CAPI/CAWI platform: Release 5.26. Washington DC, The World Bank Please, specify the version and year corresponding to the version you were using at the time of the survey.

February 8, 2018

Excessive interviews

Situation Every interview in Survey Solutions is created based on an assignment, which dictates how many interviews (often just one) must be collected. In some cases users receive more interviews at the server then the assignment required. This corresponds to values in the column “Count” are bigger than in the column “Size” in the table showing assignments. Explanation The reason for this is the following scenario: Supervisor gives assignment A to interviewer X; Interviewer X picks assignment A (synchronizes) and proceeds to the enumeration area; The supervisor changes her mind and re-assigns assignment A to interviewer Y; Interviewer Y picks assignment A (synchronizes) and proceeds to the enumeration area; At this moment both interviewers X and Y have assignment A on their tablet and have the possibility to start an interview from it; note that neither X nor Y know anything about the parallel copy of the assignment, at should normally proceed to fulfill it because it appears on their dashboards.

January 26, 2018

Local Installation: Interviewer App cannot connect to the server over HTTPS

Note: This issue has been resolved in version 18.12 (23416). Symptoms: When Interviewer app is trying to connect to the Headquarters application on a local server over the secure http (https) protocol synchronization process fails with an error “NO CONNECTION TO THE SURVEY SOLUTIONS SUPERVISOR. PLEASE MAKE SURE THAT THE WEBSITE IS AVAILABLE". The Headquarters application is setup correctly, with a valid security certificate, and in the mobile browser on the Android device users can successfully access it without any errors or warnings.

January 9, 2018

My questionnaire is not as fast as it used to be. Why?

The Survey Solutions software is being very actively developed and every new release adds new features, optimizations and efficiency improvements. However, sometimes the support team receives inquiries regarding the decrease of performance of the interviewer’s app, perhaps after an update. Here it is important to make sure that a valid comparison is made. A few common explanations to consider: � Reason Explanation 1. The questionnaire has changed This is by far the most common reason.

December 13, 2017

Features in Beta

Survey Solutions is an actively developed software. New features are added in monthly updates. Some of the features are released with status “beta”, meaning they are still being finalized and must be carefully evaluated for reliability and suitability by our clients. At the moment the following features are in the status “beta”: satellite map viewing, positioning, and area measurement on the tablets in the Interviewer App. This feature is known to be incompatible with Android 64-bit OS in versions of Survey Solutions prior to 18.

July 26, 2017

Notes on Compatibility with version 5.21

With version 5.21, we are making a big change by replacing census and sample mode with assignments. Previously when importing a questionnaire, users had to decide between sample mode (with a quantity of 1 interview per case) and census mode (with an unlimited quantity of interviews). With version 5.21, users will simply import the questionnaire and then proceed to making assignments with the imported template. Assignments will give headquarters users more flexibility because they can now specify the quantity of interviews they want when they generate each assignment.

July 5, 2017