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  3. /Working Memory Capacity Battery

Test battery

Working Memory Capacity Battery

Three tests of holding and reordering information, for working memory research: letter-number sequencing, size ordering and reading span.

Start a study with this batteryRead the guideCompare with other batteries
Tests
3, in a fixed order
Evidence
BGrade B
Time
About 34 minutes
Device
Runs on desktop, laptop, tablet or phone.
Languages
Runs in English only: Reading Span Task keeps its words and sentences in English.
Price
$0.99 academic or $2.49 commercial, per participant
Version
1.0.0

Research use only

Tests in order

Participants take the tests in this order, each with its standard settings. Changing, reordering or adjusting a test makes the study a custom study.
  1. 1
    Letter-Number Sequencing Task

    BEvidenceMain score: Runs Correct

    5-8 min
  2. 2
    Size Order Memory Test

    BEvidenceMain score: Lists Correct

    6-10 min
  3. 3
    Reading Span Task

    BEvidenceMain score: Partial Span Score

    12-16 min

Runs on desktop, laptop, tablet or phone. The app checks each participant's device before the first test. On phones and tablets, each test is compared only with sessions on the same kind of device. A test shows a percentile there once that reference group holds 50 valid sessions in the participant's age band; until then the report shows raw scores and says so.

Other orders

Possible orders
6
In a balanced Latin square
6
The 6 orders of a balanced Latin square, each test as its number in the list above
Order1st2nd3rd
11 Letter-Number Sequencing Task2 Size Order Memory Test3 Reading Span Task
22 Size Order Memory Test3 Reading Span Task1 Letter-Number Sequencing Task
33 Reading Span Task1 Letter-Number Sequencing Task2 Size Order Memory Test
43 Reading Span Task2 Size Order Memory Test1 Letter-Number Sequencing Task
51 Letter-Number Sequencing Task3 Reading Span Task2 Size Order Memory Test
62 Size Order Memory Test1 Letter-Number Sequencing Task3 Reading Span Task

A study run in this square can measure each test's position effect and the carryover between every pair of tests.

Numbers are places in the list above. A study started from this battery gives everyone that order, or rotates it and stays this battery.

Try other orders in the order lab

Published evidence

A battery takes the grade most of its tests reach. A minus means some tests have a lower grade, and a battery is never more than one letter above its weakest test. The study builder grades every study the same way.
B

Grade B: every graded test has at least grade B published evidence. 3 tests have grade B evidence.

Grade A needs at least 25 test-retest papers and 25 registered clinical studies for each test. Letter-Number Sequencing Task has 8 test-retest papers; Size Order Memory Test has 8 test-retest papers; Reading Span Task has 11 test-retest papers and 22 registered clinical studies.

Grade B means at least 8 test-retest papers, and either 5 registered clinical studies or 150 reliability or validity papers.

Grades describe the published research on each task, not this battery or ConductCognition's version of it. Source: ConductCognition test census 0.39.0, counted 31 October 2026 from OpenAlex and ClinicalTrials.gov. See every test's counts or every battery's grade

What it measures

  • Reordering letters and numbers
  • Ordering pictures by size
  • Complex span with reading

Suited to: Working memory research

Research areas: Aging and dementia

Example report

Participant report

Example data
TestMain scoreResultSession quality
Letter-Number Sequencing TaskRuns Correct13Valid
Size Order Memory TestLists Correct17Valid
Reading Span TaskPartial Span Score51Valid

No test in this battery has a reference group yet, so the report shows raw scores.

In a study, the report lists every score of each test, a percentile where a published norm covers the test and the participant's age, and each session's quality.

Price

Each participant uses one credit, however many tests: $0.99 for academic research or $2.49 for commercial research. Every account starts with 10 free participants, and yearly plans include participants each year. Compare plans

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