Setting up quality control

The settings for quality control rules depend on the type of tasks. General recommendations:

• Always use one or more ways to control quality of answers.

• Counting fast responses makes sense for most tasks.

• If the Toloker has to choose between options (for example, by selecting checkboxes), check the answers using majority vote or control tasks.

• If the Toloker has to provide a response as a text or link or upload a photo, the best way to control quality is by reviewing assignments. You can outsource task acceptance to Tolokers. Create a task with a question (for example, “Is this phrase translated correctly?”) and possible responses (for example, “yes”/“no”). Set up overlap and majority vote check.

• If a task is more like an opinion poll (for example, choosing nice pictures from a set), majority vote is not a good way to control quality. Make control tasks with artificial examples where the choice is evident.

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 Toloker completed last. This option is convenient if:

  • The pools are intended for different groups of Tolokers (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 control and training task responses 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 control and training task responses to use field in pool quality control rules.

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 Toloker 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 Tolokers.

Yes. When you copy the filter and quality control settings, the settings you previously added manually are overwritten. You should see a warning about this in the copy settings window.

Yes, if they can access both pools, they can do both of them. To restrict access to subsequent tasks for a Toloker, use the Completed tasks rule and select a ban at the project level.

No, this is incorrect. With these settings, each time a rule condition is met, the Toloker gets skill = 1. To change the skill value in the process of task review, you need a “multi-step” rule, which has multiple identical rules with different values of Total reviewed responses.

Yes, the fast response settings specify the time per task suite.

You can add a training pool to test your Tolokers. Based on the test results, assign skills to the Tolokers for the tasks they do best.

Then limit your pools to Tolokers with a certain skill using filters for this.

For a control or training assignment to be counted as correct, it must exactly match the control assignment. To do this, you need to normalize the response text using JavaScript: remove spaces, punctuation marks, special characters, and capital letters, and write the result in a separate output field. Now you can match the processed assignment text against your control text.

Another option for selecting Tolokers for a project of this type is manual review.

The Recent control and training task responses to use field is for the number of recent responses from Toloker. If you use manual review for your task, then to set up your intended rule you need to specify 3 in Total reviewed responses.

If you pass texts to the input data, you can load 2 different tasks in the pool. In one task, pass Text 1 in the INPUT: <input field name> field, and in the other task, use this field to pass Text 2. But if the text is in the HTML block of the task template, you need to clone the project. To let a Toloker do only one task in your project, use the Submitted responses rule. You can assign a skill or ban the Toloker after they submit one response.

We recommend adding at least 1% of control tasks in the pool. And for small pools — 5–10%.

The Control tasks rule starts working after the Toloker 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 Toloker in the pool or in the project). Then this percentage is updated as the tasks are completed by the Toloker. The number of the Toloker's recent responses that's used in the calculation is set in the Recent control and training task responses to use field. If you leave it empty, all the responses from the Toloker in the pool are counted.

Your training and control tasks have the same project specification. However, you can create a separate project with the tasks and assign a skill based on user responses. Then you can admit Tolokers to the main project based on their skill.

An exam pool contains only control tasks. They're usually small, only intended to make sure Tolokers know how to complete your tasks after reading the instructions and completing the training. Unlike your main pool, you already know the correct responses for every task in this pool. You can set the price to zero.

Based on the results of the control tasks, you can assign a skill to Tolokers and then use it in the main pool as a filter. For example, MySkill = 80 or = Is missing. You don't have to create an exam. For simple tasks, the training pool provides enough practice, but many requesters also use exams.

When you load tasks, use smart mixing. In this case, you'll have infinite overlap in your exam.

However, this poses the risk that you might spend a lot of money on the exam. You might want to open this pool only when the main pool opens, and close it when labeling of the main pool ends.

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.

Yes, you can do that. In this case, create the first pool based on the training pool and the exam pool based on your main pool. If a pool contains only control and/or training tasks, the price can be set to zero.

In the exam pool, you can create a skill reflecting the exam result and granting admission to the main pool. For example, if the number of responses is ≥ 10, set the skill value in the <exam skill> as % of correct responses. Here are the requirements you should use for Tolokers in the exam pool: <skill being tested for> < 80 or = none>. In the main pool, set up a filter: <exam skill> >= 80 and (<main skill> >= 70 or = Is missing). You can choose the skill values depending on how well the Tolokers perform your task.

Technically, if you have only one task in your training pool, you don't have this option. The skill will be either 0 or 100. We recommend that you add several tasks, or at least 2 so that the Toloker will practice on the first task and will be able to do the second task correctly. In this case, you can admit users to your main pool starting from the skill value of 50.

You can also create a training pool based on the main pool. Assign a skill using the Control tasks rule, in which case, you can admit Tolokers to your main pool with any skill level, zero included. But we don't advise giving tasks to people who failed training.

This is the total number of responses to the control questions.

No. But you can create a pool of the Training type based on your main pool and enable manual review there.

No, they can't.

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.

You can deny access to the pool if the Toloker's responses are too fast, if they don't match the majority vote, or if the Toloker makes too many mistakes in control tasks. Tasks completed by such Tolokers can be given to other Tolokers.

If the Toloker already got paid for the tasks, you can't get your money back.

No, Tolokers don't know when they're blocked.

No. The responses of these Tolokers aren't automatically excluded from the final results file.

But you can do it yourself if you want. When downloading the results, select the option Exclude assignments by banned users to delete the responses of Tolokers who were banned at the moment of downloading. You can also forward all the assignments from banned Tolokers to other Tolokers using the Re-completion of assignments from banned users rule.

You can create a task pool for all your Tolokers and create Toloker skills in it. In this case, you can open your tasks only to the Tolokers with the necessary skills.

Yes, unfortunately, this can happen. This is why we recommend that you offer a training task or exam before the general task. In this case, only those people who showed good performance at the previous stage are selected for the main pool.

All responses to the task are taken into account. If one response differs from the majority vote, the whole task is counted as mismatching the responses of other Tolokers.

To assign a skill to or ban Tolokers based on the majority vote, add a relevant rule to the pool.

Don't forget to enable Keep task order in the pool parameters. Majority vote is used in the projects with preset options (radio buttons or checkboxes). This rule won't apply to the text entry or file upload fields.

Possible reasons:

• You've stopped the main pool. This could limit the number of Tolokers with access to the pool. Start the training pool again. There will be more Tolokers who can access the tasks.

• The filters you set are too strict. For example, a strong restriction on a certain skill that most Tolokers don't have.

• Too many Tolokers are banned. Ease the quality control rules.

• To motivate Tolokers, assign a public skill and use dynamic pricing.

• Try to increase the project rating, so that your task is higher in the list of tasks for Tolokers.

• Adjust the quality-speed ratio.

• Set a higher priority for the pool among other project pools.