Control tasks

Control tasks contain samples of correct responses. They allow you to monitor the quality of task completion without having to check all the responses. Control tasks simplify the verification process, help identify performers' qualifications, and save your time.

When to use

Use control tasks to assign a skill to performers based on their responses and ban performers who submit incorrect responses.

Don't use it if:
  • You have a lot of response options.
  • Users need to attach a file to their assignment.
  • Users need to transcribe text.
  • Users need to select objects in a photo.
  • Tasks don't have a correct or incorrect response. For example: “Which image do you like best?” or “Choose the page design option that you like best”.

Rule settings

Attention.

The If and then fields in this rule are mandatory. If you don't fill in at least one field, you won't be able to save the rule.

Field

Overview

Recent values to use

The number of the performer's last responses to control tasks.

To calculate control task responses from all project pools, fill in the field in the rule for each pool.

If this field is not filled in, the calculation includes responses in control tasks only in the pool to which the rule applies.

If

A condition for performing the action in the then field:
  • number of responses — The number of completed control and training tasks.

  • correct responses (%) — The percentage of correct responses in training and control tasks (from 0 to 100).

  • incorrect responses (%) — The percentage of incorrect responses in training and control tasks (from 0 to 100).

  • number of control responses — The number of completed control tasks.
  • correct control responses (%) — The percentage of correct responses in control tasks (from 0 to 100).
  • incorrect control responses (%) — The percentage of incorrect responses in control tasks (from 0 to 100).

To add multiple conditions, click .

then

Action to perform for the condition:

  • assign skill from the field — Save the percentage of the performer's correct responses in control tasks as a skill value.

  • assign skill value — Assign a fixed value to the skill.

  • accept user's answers — Requires the non-automatic acceptance option to be set.

    Useful if the performer completes most tasks well. Example: The Toloker completed more than 80% of the tasks correctly and you are satisfied with this result. The rule will work automatically and accept all responses in the pool.

  • suspend — Suspend the performer's access to the pool for the specified number of days. Only the requester can view the reason.

  • ban — Block access to the project or all of the requester's projects for the specified number of days. Only the requester can view the reason.

    If access to tasks is blocked temporarily (for example, for 7 days), the history of the performer's responses is not saved after the ban is lifted. The skill value is based on new responses.

Field

Overview

Recent values to use

The number of the performer's last responses to control tasks.

To calculate control task responses from all project pools, fill in the field in the rule for each pool.

If this field is not filled in, the calculation includes responses in control tasks only in the pool to which the rule applies.

If

A condition for performing the action in the then field:
  • number of responses — The number of completed control and training tasks.

  • correct responses (%) — The percentage of correct responses in training and control tasks (from 0 to 100).

  • incorrect responses (%) — The percentage of incorrect responses in training and control tasks (from 0 to 100).

  • number of control responses — The number of completed control tasks.
  • correct control responses (%) — The percentage of correct responses in control tasks (from 0 to 100).
  • incorrect control responses (%) — The percentage of incorrect responses in control tasks (from 0 to 100).

To add multiple conditions, click .

then

Action to perform for the condition:

  • assign skill from the field — Save the percentage of the performer's correct responses in control tasks as a skill value.

  • assign skill value — Assign a fixed value to the skill.

  • accept user's answers — Requires the non-automatic acceptance option to be set.

    Useful if the performer completes most tasks well. Example: The Toloker completed more than 80% of the tasks correctly and you are satisfied with this result. The rule will work automatically and accept all responses in the pool.

  • suspend — Suspend the performer's access to the pool for the specified number of days. Only the requester can view the reason.

  • ban — Block access to the project or all of the requester's projects for the specified number of days. Only the requester can view the reason.

    If access to tasks is blocked temporarily (for example, for 7 days), the history of the performer's responses is not saved after the ban is lifted. The skill value is based on new responses.

Examples of rules

Purpose: filter out performers who often make mistakes.

Solutions:

Attention. The assignments submitted by banned performers will be taken into account if they are not rejected manually using assignment review They can be reassigned by setting up the Recompletion of assignments from banned users rule.
Ban performers based on control tasks and the percentage of correct responses




Both rules work independently:

  1. If the performer gives at least 3 responses to the control tasks, the percentage of correct answers is assigned as the skill value. This is useful if you want to prevent performers with a low skill level from completing your tasks.
  2. If the performer gives at least 3 responses to the control tasks and the percentage of correct answers is less than 60%, they lose access to the project.

The calculation uses up to 10 of the performer's recent responses to the project's control tasks.

Set a skill and deny access to performers with a low skill level

Skills help identify how well performers do your tasks. You can ban performers with low skill levels from completing tasks in your pool or project.



If the performer completes 3 control or training tasks, they get a skill. Use the skill value to set access to other pools with filters.

Example of filter settings


Ban performers if their percentage of correct responses to control tasks is less than 40%


If the percentage of correct responses in the control tasks is less than 40%, the performer loses access to the project for 30 days.

This rule doesn't take into account responses in the training tasks for banning.

Troubleshooting

How many control tasks do I need to add?

We recommend adding at least 1% of control tasks in the pool. To filter out performers, use the Control tasks quality control rule. To rank performers by the quality of responses in control tasks, use a skill.

How are the correct responses to control questions counted?

The Control tasks rule starts working after the performer completes the number of control tasks you specified. If your pool contains both training and control tasks, you can take into account the responses in both of them (the Number of responses parameter) or only in control tasks (the Number of control responses parameter).

As soon as the needed number of responses is collected, Toloka calculates the percentage of correct and incorrect responses and performs an action (assigns a skill, or blocks the user in the pool or in the project). Then this percentage is updated as the tasks are completed by the performer. The number of the performer's last responses used for the calculation is set in the Recent values to use field. If you leave it empty, all the responses from the performer in the pool are counted.

Should I create a skill for every pool?

It is better to use one skill in a project. You can choose the way to calculate the skill:

  • Calculate the skill for each pool separately. The current skill value is the value of the skill in the pool the user completed last. This option is convenient if:

    • The pools are intended for different groups of performers (for example, there are filters by city or country).

    • Pools are started one by one and you don't want to take into account the responses in the previous pools to calculate the skill in the current pool.

    This calculation method is used by default when adding a quality control rule to a pool. For the control tasks block, leave the Recent values to use field empty.

  • Calculate skill based on all tasks in a project This option is good if the pools are small and you don't need to have skill calculated for each pool.

    This option is available only for skills on control tasks. To use it, fill in the Recent values to use field in quality control rules in pools.

Can I use a skill beyond a particular pool or project and apply it to other projects as well?

Yes, of course — you can use the same skill for different projects. But most often, a skill is intended for a specific project. If the performer completes a certain task well, this doesn't mean that they will complete other ones successfully. Another disadvantage is that if you filter by skills that were set long ago, you will artificially limit the number of available performers.

How do I move control tasks from the Sandbox to the main pool?

The tasks themselves are not exported, only the project configuration and the settings of the selected pool. You can download the completed tasks from the pool in the Sandbox and import them to the exported pool.

To download only the control tasks (if you completed them in the interface), go to Mark up, then click Control tasks and Download.

If I upload tasks using smart mixing, does it mean that the same file should contain both the control tasks and main tasks?

You can upload your main and control tasks separately using different files.

If a cheating performer gives a lot of incorrect responses, and the system eventually bans them for errors in control tasks, do I have to pay for the bad responses anyway?

If the user already got paid for the tasks, the money can't be refunded to you.

When I export a project from the Sandbox, the task files are not exported. Is this how it's supposed to work? I suddenly lost the markup of the control tasks that I created in the sandbox.

The tasks themselves are not exported, only the project configuration and the settings of the selected pool. However, you can download your marked up tasks from the Sandbox pool and import them to the pool you created. To download the control tasks only (if you marked them up in the interface), go to Mark up, then click Control tasks and Download.

How do I use smart mixing to upload my main tasks separately from control tasks?

Smart mixing is set up when you upload tasks to the pool. After creating a pool, click Upload and select the method for generating task suites. You can upload them using separate files or one file, arranging them in any order.