Explaining computerized English testing in plain English

ɫèAV Languages
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Research has shown that automated scoring can give more reliable and objective results than human examiners when evaluating a person’s mastery of English. This is because an automated scoring system is impartial, unlike humans, who can be influenced by irrelevant factors such as a test taker’s appearance or body language. Additionally, automated scoring treats regional accents equally, unlike human examiners who may favor accents they are more familiar with. Automated scoring also allows individual features of a spoken or written test question response to be analyzed independent of one another, so that a weakness in one area of language does not affect the scoring of other areas.

was created in response to the demand for a more accurate, objective, secure and relevant test of English. Our automated scoring system is a central feature of the test, and vital to ensuring the delivery of accurate, objective and relevant results – no matter who the test-taker is or where the test is taken.

Development and validation of the scoring system to ensure accuracy

PTE Academic’s automated scoring system was developed after extensive research and field testing. A prototype test was developed and administered to a sample of more than 10,000 test takers from 158 different countries, speaking 126 different native languages. This data was collected and used to train the automated scoring engines for both the written and spoken PTE Academic items.

To do this, multiple trained human markers assess each answer. Those results are used as the training material for machine learning algorithms, similar to those used by systems like Google Search or Apple’s Siri. The model makes initial guesses as to the scores each response should get, then consults the actual scores to see well how it did, adjusts itself in a few directions, then goes through the training set over and over again, adjusting and improving until it arrives at a maximally correct solution – a solution that ideally gets very close to predicting the set of human ratings.

Once trained up and performing at a high level, this model is used as a marking algorithm, able to score new responses just like human markers would. Correlations between scores given by this system and trained human markers are quite high. The standard error of measurement between ɫèAV’s system and a human rater is less than that between one human rater and another – in other words, the machine scores are more accurate than those given by a pair of human raters, because much of the bias and unreliability has been squeezed out of them. In general, you can think of a machine scoring system as one that takes the best stuff out of human ratings, then acts like an idealized human marker.

ɫèAV conducts scoring validation studies to ensure that the machine scores are consistently comparable to ratings given by skilled human raters. Here, a new set of test-taker responses (never seen by the machine) are scored by both human raters and by the automated scoring system. Research has demonstrated that the automated scoring technology underlying PTE Academic produces scores comparable to those obtained from careful human experts. This means that the automated system “acts” like a human rater when assessing test takers’ language skills, but does so with a machine's precision, consistency and objectivity.

Scoring speaking responses with ɫèAV’s Ordinate technology

The spoken portion of PTE Academic is automatically scored using ɫèAV’s Ordinate technology. Ordinate technology results from years of research in speech recognition, statistical modeling, linguistics and testing theory. The technology uses a proprietary speech processing system that is specifically designed to analyze and automatically score speech from fluent and second-language English speakers. The Ordinate scoring system collects hundreds of pieces of information from the test takers’ spoken responses in addition to just the words, such as pace, timing and rhythm, as well as the power of their voice, emphasis, intonation and accuracy of pronunciation. It is trained to recognize even somewhat mispronounced words, and quickly evaluates the content, relevance and coherence of the response. In particular, the meaning of the spoken response is evaluated, making it possible for these models to assess whether or not what was said deserves a high score.

Scoring writing responses with Intelligent Essay Assessor™ (IEA)

The written portion of PTE Academic is scored using the Intelligent Essay Assessor™ (IEA), an automated scoring tool powered by ɫèAV’s state-of-the-art Knowledge Analysis Technologies™ (KAT) engine. Based on more than 20 years of research and development, the KAT engine automatically evaluates the meaning of text, such as an essay written by a student in response to a particular prompt. The KAT engine evaluates writing as accurately as skilled human raters using a proprietary application of the mathematical approach known as Latent Semantic Analysis (LSA). LSA evaluates the meaning of language by analyzing large bodies of relevant text and their meanings. Therefore, using LSA, the KAT engine can understand the meaning of text much like a human.

What aspects of English does PTE Academic assess?

Written scoring

Spoken scoring

  • Word choice
  • Grammar and mechanics
  • Progression of ideas
  • Organization
  • Style, tone
  • Paragraph structure
  • Development, coherence
  • Point of view
  • Task completion
  • Sentence mastery
  • Content
  • Vocabulary
  • Accuracy
  • Pronunciation
  • Intonation
  • Fluency
  • Expressiveness
  • Pragmatics

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    Critical thinking is a term often thrown around the teacher’s lounge. You often hear, “Of course, teaching critical thinking is essential.” However, in that same space, we may also hear the question, “But how?”

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    What does it mean to think critically?

    Critical thinking is a complex process that involves students reflecting, analyzing and evaluating ideas. Building a community of critical thinkers in our classrooms involves going beyond the cognitive domains and building the affective domains.

    The cognitive domain concerns subject knowledge and intellectual skills, whereas the affective domain involves emotional engagement with an idea or learning material.

    This deliberate teaching of critical thinking needs to be part of our teaching toolkit. We need to develop a mindset around it in and out of our classrooms.

    How can teachers develop a critical-thinking mindset?

    Consider all the questions we pose to students during our classes. Do we expect a yes or no answer, or have we established a classroom environment where students offer considered reasons for their responses?

    By following some guiding principles, we can get into the practice of naturally expecting deeper answers:

    1. Students need to engage in critical thinking tasks/activities at all levels.
    2. Teachers need to provide space/time in the classroom to build critical thinking learning opportunities.
    3. Practicing critical thinking must be incorporated throughout the course, increasing complexity as students improve their critical thinking ability.
    4. Students must be given opportunities to practice transferring critical thinking skills to other contexts.

    Activities to foster critical thinking in the classroom

    Activity/Strategy #1: Categorizing

    Provide a set of vocabulary terms or grammatical structures on the board (or pictures for true beginners). Ask your students to gather in pairs or small groups and have them categorize the list. Ask them to be creative and see how diverse the categories can be.

    Example:

    Desk, computer, pencil, stove, dishes, forks, novel, cookbook, sink, shelf

    • Made from trees: pencil, novel, cookbook, desk.
    • Made from metal: fork, stove, sink, etc.

    Activity/Strategy #2: What’s the problem?

    Provide students with a short reading or listening and have your students define a problem they read or hear.

    Tomas ran up the steps into Building A. The door was closed, but he opened it up. He was very late. He took his seat, feeling out of breath.

    • Determine why Tomas was late.
    • Underline verbs in the past tense.
    • Create a beginning or ending to the story.

    Activity/Strategy #3: Circles of possibility

    Present a problem or situation. Consider the problem presented in strategy #2 above: Ask the students to evaluate the situation from Tomas’ point of view, then, from the teacher’s point of view, and then from his classmate’s point of view.

    This activity generates many conversations, and even more critical thinking than you can imagine!

    Activity/Strategy #4: Draw connections

    Provide students with a list of topics or themes they have studied or are interested in. Place one in the center, and ask them to draw connections between each one.

    Afterward, they should explain their ideas. For example:

    “Energy and environment are affected by sports. Most sports do not harm the environment, but if you think about auto racing, it uses a lot of fuel. It can negatively impact the environment.”

    Activity/Strategy #5: What’s the rule?

    Play students an audio clip or provide them with a reading text. Draw students’ attention to a particular grammatical structure and ask them to deduce the rules.

    Activity/Strategy #5: Establishing context

    Show your class an image and put your students in small groups. Give each group a task. For example:

    The Jamestown settlement in the United States
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    Ask questions like this:

    • If this were in a movie, what would the movie be about?
    • If this were an advertisement, what would it be advertising?
    • If this were a book, what would the book be about?

    There are many other wonderful strategies that can help build a classroom of critical thinkers. Getting your students accustomed to these types of tasks can increase their linguistic and affective competencies and critical thinking. In addition to these on-the-spot activities, consider building in project-based learning.

    How can you incorporate project-based learning into your classroom?

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    They also represent what students are likely to encounter when they leave our English language classes.

    An example project

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    You can imagine the amount of language students will use working on this project, while, at the same time, building a critical mindset.

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    • The spoken and written form
    • The parts of the word that have meaning
    • The word's forms and their meanings
    • The concepts and vocabulary associated with the word
    • The grammatical function, any collocations
    • The register and frequency of the word

    That is a whole lot!

    To build this extensive knowledge, we need to do so in an intentional manner. We need to build various activities that develop and foster critical thinking skills and engage students.

    Here is an example:

    “Hello! I am so glad to see so many of you at our special lecture today. Today, I am going to describe how a mixed community is planned and built. First, let’s look at what a mixed purpose community is, and then we will discuss the planning and building. As many of you know, a mixed purpose community is a neighborhood that includes residential spaces, business spaces, services and green spaces. How about the planning? First, when planning mixed purpose communities, architects, city planners and builders work together to plan where everything will be located. Because they want the community to be a fully walkable one, they need to think about how far homes are from schools, services and other businesses. Then, they carefully look at what kinds of businesses and services are needed. Next, they must design sidewalks so people can easily get to anywhere in the community, and not worry about car traffic. Today, planners are even looking at including bicycle paths, as more and more people are riding bicycles to work. Lastly, they need to consider the different types of residential space they will need. They build homes and apartments to attract all a wide variety of residents. These communities are becoming more and more popular, but planning them still takes time and a team of people.”

    The terms mixed and community are bolded. You can engage students with a simple noticing activity of how these words are used, the forms they take, the words around them, their collocations and the concepts associated with these words. An exercise like this will help students develop a deep understanding of these words. And that deep understanding will enable students to make connections and draw conclusions around these terms.

    Bridging the academic gap

    EAP students move from very scaffolded EAP courses to courses where they must listen and take notes for 50 minutes or read 50+ pages before class. Additionally, their professors often do not build background knowledge, or scaffold learning, as they expect students to enter their classrooms with this understanding. And this can create an academic gap.

    When it comes to bridging this gap, content can be the vehicle for instruction. Exposing students to the language of academic disciplines early on can build background knowledge, and be highly motivating for students who crave more than rote language instruction.

    Bringing the social gap

    When students enter their university courses they will be expected to work with peers, engage in group activities, negotiate, take turns and assert their own ideas into a dialogue. These social skills require language which needs to be developed and practiced in their EAP courses.
    You can do this by building instructional tasks and learning around developing and practicing critical thinking skills. Consider introducing project-based learning to your class. In project-based learning, students must work with their peers, learning how to prioritize, negotiate and assign responsibility. Bringing in these types of tasks and activities helps develop soft and critical thinking skills.