Transaction

A transaction is an interaction between the student and the tutoring system.

Students may make incorrect entries or ask for hints before getting a step correct. Each hint, incorrect action, or correct action is a transaction; and a step can involve one or more transactions.

In the transaction table excerpt below, a list of transactions is displayed for a single student working on two tutor problems. Transaction 9 shows that the student correctly entered a '4' in the tutor interface. Transaction 10 shows the correct entry of the '8'. In both cases, there is one transaction for each step. In transactions 11 and 12, we see incorrect entries ('32','4') for the 'Area of the scrap metal'. The student returns to this step in transaction 15 and correctly enters 13.76, but first finds the areas of the square and circle (transactions 13 and 14). The step (SCRAP-METAL-AREA Q1) therefore involved three transactions. These multiple transactions are also known as attempts for the given step.

Table-1: Transaction table excerpt
# Student Problem Step Attempt # Student Input Evaluation Knowledge component
1 S01 WATERING_VEGGIES (SPRAY-RADIUS Q1) 1 2 CORRECT Enter-Given
2 S01 WATERING_VEGGIES (WATERED-AREA Q1) 1 12.56 CORRECT Circle-Area
3 S01 WATERING_VEGGIES (TOTAL-GARDEN Q1) 1 39.43 INCORRECT
4 S01 WATERING_VEGGIES (TOTAL-GARDEN Q1) 1 94.985 INCORRECT
5 S01 WATERING_VEGGIES (TOTAL-GARDEN Q1) 2 HINT HINT
6 S01 WATERING_VEGGIES (TOTAL-GARDEN Q1) 3 30.25 CORRECT Rectangle-Area
7 S01 WATERING_VEGGIES (UNWATERED-AREA Q1) 1 17.69 CORRECT Compose-Areas
8 S01 WATERING_VEGGIES DONE 1 DONE CORRECT Determine-Done
9 S01 MAKING-CANS (POG-RADIUS Q1) 1 4 CORRECT Enter-Given
10 S01 MAKING-CANS (SQUARE-BASE Q1) 1 8 CORRECT Enter-Given
11 S01 MAKING-CANS (SCRAP-METAL-AREA Q1) 1 32 INCORRECT
12 S01 MAKING-CANS (SCRAP-METAL-AREA Q1) 2 4 INCORRECT
13 S01 MAKING-CANS (SQUARE-AREA Q1) 1 64 CORRECT Square-Area
14 S01 MAKING-CANS (POG-AREA Q1) 1 50.24 CORRECT Circle-Area
15 S01 MAKING-CANS (SCRAP-METAL-AREA Q1) 3 13.76 CORRECT Compose-Areas
16 S01 MAKING-CANS (POG-RADIUS Q2) 1 8 CORRECT Enter-Given
17 S01 MAKING-CANS (SQUARE-BASE Q2) 1 16 CORRECT Enter-Given
18 S01 MAKING-CANS (SQUARE-AREA Q2) 1 256 CORRECT Square-Area
19 S01 MAKING-CANS (POG-AREA Q2) 1 200.96 CORRECT Circle-Area
20 S01 MAKING-CANS (SCRAP-METAL-AREA Q2) 1 55.04 CORRECT Compose-Areas
21 S01 MAKING-CANS (POG-RADIUS Q3) 1 12 CORRECT Enter-Given
22 S01 MAKING-CANS (SQUARE-BASE Q3) 1 24 CORRECT Enter-Given
23 S01 MAKING-CANS (SQUARE-AREA Q3) 1 576 CORRECT Square-Area
24 S01 MAKING-CANS (POG-AREA Q3) 1 452.16 CORRECT Circle-Area
25 S01 MAKING-CANS (SCRAP-METAL-AREA Q3) 1 123.84 CORRECT Compose-Areas
26 S01 MAKING-CANS DONE 1 DONE CORRECT Determine-Done