> ## Documentation Index
> Fetch the complete documentation index at: https://docs.instructorphp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Examine context

## Overview

Encouraging the model to examine each source in context helps mitigate irrelevant information and improves reasoning quality. This is known as Thread of Thought.

## Example

```php theme={null}
<?php
require 'examples/boot.php';

use Cognesy\Instructor\StructuredOutput;
use Cognesy\Instructor\Extras\Sequence\Sequence;

class ThreadOfThoughtResponse {
    /** @var string[] */
    public array $analysis; // explanations for each relevant source
    public int $correct_answer;
}

class ThreadOfThought {
    public function __invoke(string $query, array $context) : ThreadOfThoughtResponse {
        $sources = implode("\n", $context);
        $system = <<<TXT
        You are an expert Question Answerer.
        Here are the sources you should refer to for context:
        {$sources}
        TXT;
        return StructuredOutput::using('openai')->with(
            messages: [
                ['role' => 'system', 'content' => $system],
                ['role' => 'user', 'content' => $query],
                ['role' => 'assistant', 'content' => 'Navigate through the context incrementally, identifying and summarizing relevant portions.'],
            ],
            responseModel: ThreadOfThoughtResponse::class,
        )->get();
    }
}

$context = [
    'The price of a house was $100,000 in 2024',
    'The Great Wall of China is not visible from space with the naked eye',
    'Honey never spoils; archaeologists found 3,000-year-old edible honey in Egyptian tombs',
    "The world's oldest known living tree is over 5,000 years old and is located in California",
    'The price of a house was $80,000 in 2023',
];
$query = 'What was the increase in the price of a house from 2023 to 2024?';
$response = (new ThreadOfThought)($query, $context);
dump($response);

assert($response instanceof ThreadOfThoughtResponse);
assert(is_array($response->analysis));
assert(count($response->analysis) > 0);
assert(is_int($response->correct_answer));
?>
```

## Useful Tips

Here are some alternative phrases that you can add to your prompt to generate a thread of thought before your model generates a response.

* In a step-by-step manner, go through the context, surfacing important information that could be useful.
* Walk me through this lengthy document segment by segment, focusing on each part's significance.
* Guide me through the context part by part, providing insights along the way.
* Divide the document into manageable parts and guide me through each one, providing insights as we move along.
* Let's go through this document piece by piece, paying close attention to each section.
* Take me through the context bit by bit, making sure we capture all important aspects.
* Examine the document in chunks, evaluating each part critically before moving to the next.
* Analyze the context by breaking it down into sections, summarizing each as we move forward.
* Navigate through the context incrementally, identifying and summarizing relevant portions.
* Proceed through the context systematically, zeroing in on areas that could provide the answers we're seeking.
* Take me through this long document step-by-step, making sure not to miss any important details.
* Analyze this extensive document in sections, summarizing each one and noting any key points.
* Navigate through this long document by breaking it into smaller parts and summarizing each, so we don't miss anything.
* Let's navigate through the context section by section, identifying key elements in each part.
* Let's dissect the context into smaller pieces, reviewing each one for its importance and relevance.
* Carefully analyze the context piece by piece, highlighting relevant points for each question.
* Read the context in sections, concentrating on gathering insights that answer the question at hand.
* Let's read through the document section by section, analyzing each part carefully as we go.
* Let's dissect this document bit by bit, making sure to understand the nuances of each section.
* Systematically work through this document, summarizing and analyzing each portion as we go.
* Let's explore the context step-by-step, carefully examining each segment.
* Systematically go through the context, focusing on each part individually.
* Methodically examine the context, focusing on key segments that may answer the query.
* Progressively sift through the context, ensuring we capture all pertinent details.
* Take a modular approach to the context, summarizing each part before drawing any conclusions.
* Examine each segment of the context meticulously, and let's discuss the findings.
* Approach the context incrementally, taking the time to understand each portion fully.
* Let's scrutinize the context in chunks, keeping an eye out for information that answers our queries.
* Walk me through this context in manageable parts step by step, summarizing and analyzing as we go.
* Let's take a segmented approach to the context, carefully evaluating each part for its relevance to the questions posed.

### References

1. Thread of Thought Unraveling Chaotic Contexts ([https://arxiv.org/pdf/2311.08734](https://arxiv.org/pdf/2311.08734))