Reading and Literature Studies · Reading Informational and Graphic Texts

Extending Understanding: Synthesis and Putting Sources in Conversation

1.5About 70 minutes

Learning goals

I can describe precisely how two texts relate: supports, extends, complicates, qualifies or contradicts.
I can use a synthesis matrix to organize several sources by sub-question.
I can write a synthesis claim that goes beyond what any single source says.
I can connect texts to my own knowledge and experience and to the world, and explain how those connections deepen my understanding.

Words to know

synthesis
Combining ideas from several sources into a new understanding that no single source states.

synthesis matrix
A grid with sources in rows and sub-questions in columns, used to see where sources agree, differ or leave gaps.

qualify
To limit a claim by adding conditions (true, but only when...).

complicate
To add a factor that makes a claim harder to accept as simple, without disproving it.

gap
A question none of the sources answers.

rich connection
A link between texts, or between a text and the world, that changes or deepens your understanding, not just a surface similarity.

Hook: joining a conversation already in progress

The philosopher and critic Kenneth Burke compared reading and research to arriving late at a lively discussion. People have been talking for a long time before you arrive. You listen until you catch the drift, then you put in your own contribution. Others answer. The discussion goes on after you leave.

Every text you read is one voice in a conversation like this. Synthesis is the skill of hearing the whole conversation and saying something new in it.

Remember from Grade 11

In ENG3U you compared an editorial with other texts on the same issue and learned that synthesis is more than summary: the smoothie, not the fruit salad. Grade 12 adds precise relationship words, the synthesis matrix, and a synthesis claim that no single source makes.

Four short sources on one issue

All four sources were written for this lesson; the people, town and numbers are invented.

Source A: from a town forestry report. Mature street trees shade pavement, lower surface temperatures and reduce the need for air conditioning in nearby homes. Planting 2,000 trees over ten years would increase canopy cover on residential streets from 18% to about 25%. Trees take 15 to 20 years to reach full shade.

Source B: from an opinion column by a homeowner. Every tree the town plants is a tree someone must water, prune and eventually remove. My neighbour paid to repair a sewer line cracked by roots. Before we plant 2,000 trees, the town should tell us who pays when they cause damage.

Source C: from a personal essay by a resident. During the July heat wave, my apartment on the fourth floor never cooled below 30°C. The new subdivision across the road has wide lawns and old maples. Our block has a parking lot. Heat, I learned that week, is not shared equally.

Source D: a data graphic (below), showing afternoon surface temperatures measured on one hot day.

Source D in this lesson's set. The shaded asphalt is 18 °C cooler than the asphalt in full sun (52 − 34 = 18), and shaded grass is cooler still. Notice the note: these are surface temperatures, not air temperatures, which limits what the graphic can prove.

Naming relationships precisely

Source B is different from Source A tells a reader almost nothing. Use precise relationship words:

Supports: gives evidence for the same claim (D supports A's claim that shade lowers surface temperature).
Extends: takes a claim further, to a new case or consequence (C extends the cooling claim to a question of fairness: who gets shade).
Complicates: adds a factor that makes the claim less simple, without disproving it (B adds costs and damage).
Qualifies: adds a condition or limit (A itself qualifies the plan: trees take 15 to 20 years to give full shade, so they cannot help this summer's heat wave).
Contradicts: says the opposite on the same point. (None of these sources truly contradicts another. B does not deny that trees cool streets; it asks who pays.)

A conversation map. The arrows name relationships, which is the raw material for synthesis. The bottom arrow means C's experience qualifies B's cost worry: costs matter, but so does who bears the heat.

Source	Do trees cool streets?	What are the costs?	Who benefits?
A: forestry report	Yes: shade lowers surface temperature	Implied: 10-year planting program	Residential streets generally
B: homeowner column	Not disputed	Watering, pruning, removal, root damage	Asks who pays
C: resident essay	Implied by contrast of lawns and lot	Not discussed	Unequal: shaded subdivision vs. parking-lot block
D: data graphic	Yes: 18 °C cooler surface in shade	Not discussed	Not discussed

A synthesis matrix. Read down each column to see agreement and gaps. The Who benefits? column shows a gap: no source says where the 2,000 trees would be planted.

Worked example

Let's write a synthesis claim

Use the matrix to write a synthesis claim about the tree-planting plan, then support it with all four sources.

Weak (summary in a row): Source A says trees cool streets. Source B says they cost money. Source C says heat is unequal. Source D shows shade is cooler. Four facts, no new idea.
Look for tension and gaps: everyone accepts the cooling; the disagreement is about costs and who benefits; no one says where trees go.
Synthesis claim: The sources agree that street trees cool neighbourhoods; the real question they raise is not whether to plant, but where and at whose expense, since the blocks with the least shade are likely the ones with the most to gain.
Support: A and D establish cooling (an 18 °C difference in surface temperature in D); B raises cost and responsibility; C shows that shade is unevenly shared now; A's 15 to 20 years qualifies the timeline, which makes choosing locations early more important.
Check: the claim goes beyond every single source (none of them says plant first where shade is scarcest), and every part is supported.

A synthesis claim usually moves the question: from should we? to where, how, or for whom? It is built from the tensions and gaps in the matrix, not from the sources one by one.

Rich connections to yourself and the world

The curriculum also asks you to connect texts to your own knowledge and experience and to the world around you. A connection is rich when it changes your understanding.

Surface: I was hot last summer too.
Rich: Source C made me notice that my school's parking lot has no trees while the staff lot does. Heat inequality is not only between neighbourhoods; it can happen on one property. This extends the conversation with new evidence.

Connections to the world work the same way. Linking these sources to news coverage of heat waves in Canadian cities, or to how your own town decides where to plant trees, turns a reading exercise into an informed opinion.

Just for fun

A synthesis that just lists sources one by one is sometimes called a book report sandwich. It is filling, but nobody has ever asked for seconds.

Hands-on activity

Shade survey and synthesis

You need: a notebook, a pen, and a 20-minute walk in your neighbourhood with a grown-up or friend (in any season; in winter, look at tree locations rather than shade).

Count the street trees on two different blocks: one residential street and one commercial or parking-lot area.
Note where trees are, and where people wait or walk in the open (bus stops, school entrances).
Add your observations as Source E in the matrix above.
Write a synthesis claim that uses at least three sources, including your own observations.
Name one gap your survey reveals that none of the sources addressed.

What to look for: a claim that moves the question; precise relationship words; your observations used as evidence, not decoration.

Your turn

What is the difference between complicates and contradicts?

How does Source B relate to Source A?

How does Source C extend the cooling claim?

By how much was shaded asphalt cooler than sunny asphalt in Source D?

What limitation does Source D's note reveal?

What gap does the matrix reveal?

Why is the summary in a row response not a synthesis?

More practice: warm-up

What goes in the rows and columns of a synthesis matrix?

How long does Source A say trees take to give full shade?

What does qualify mean when describing a claim?

Name the five relationship words in this lesson.

What canopy cover does Source A predict after ten years?

More practice: on your own

Turn this surface connection into a rich one: Source C reminds me of a hot day I had.

Write a sentence that uses Source A to qualify Source C.

Why must a synthesis paragraph still cite each source?

Propose a fifth source that would fill the gap in the matrix, and say what form it would take.

A student writes: All four sources agree, so the town should plant trees everywhere. What is wrong?

Challenge

Write a 4-sentence synthesis paragraph that uses all four sources and ends with a gap for further research.

Burke's image says that the conversation continues after you leave. What does that suggest about how a synthesis claim should be worded?

Explain how Source C's form (a personal essay) is both a strength and a limitation as evidence in this conversation.

Check your understanding

Quiz

Source B accepts that trees cool streets but raises costs. B therefore...

A synthesis matrix lists...

Which is a synthesis claim rather than a summary?

Source D shows asphalt at 52 °C in sun and 34 °C in shade. The difference is...

A rich connection to your own experience...

A gap in a set of sources is...

For parents and teachers

What this lesson teaches: ENG4U Reading and Literature Studies 1.5: extending understanding of complex texts by making rich connections among texts, to personal knowledge and experience, and to the world.

How to help at home:

When your teen reads two articles on one issue, ask: Do they disagree, or do they just focus on different things?
Ask for a claim that neither article makes. That is synthesis.
Share your own experience of the issue (a heat wave, a neighbourhood change) and ask how it fits with what they read.

Common difficulties:

Source-by-source summaries. Push for one claim built from all of them.
Calling every difference a contradiction. Most sources complicate or qualify each other.
Personal connections that stay on the surface. Ask: How does that change what you think?

Facts used: all four sources, the town and the data are invented for teaching. Kenneth Burke's image of research as an ongoing conversation is paraphrased, not quoted.