The diagram below illustrates how household waste is recycled to produce electricity.
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Sample Response
The flow chart delineates the productionmanufacturing process of electricity from methane generated from the treatment of household waste materials.
There are six stages in total, commencing with collectingaccumulating household waste and culminating in the transfertransferring of electricity to factories and homes. This process can be dividedre-categorized into three major groups, namely collecting and sorting waste, producing methane and electricity, and the finalmethane and electricity and final usage of energy in plants and houses.
Initially, household waste is collected by garbage trucks from houses before being transported into a sorting center for categorization. Then, in the sorting center, waste is classified into three types, including compost for agriculture, recycling for new products like plastic bottles and boxes, and organic waste which is buried in the sealed underground container where the anaerobic environment with 30 to 50 degrees Celsius30 to 50 Celsius degrees enables the generation of methane gas. Subsequently, through a pipe, methane is transferred into the gas cleaning unit which is used to purify the raw gascleanse unclean gas. Next, the generator is powered by methane to generate electricity.
Turning to the application of electricity, electricity is transmitted into the grid, after which homes and factories are provided with electricity.
Why this response received Band 8.0
The response presents a thorough and highly accurate description of the process, featuring a clear overview and precise sequential detailing of each stage. Paragraphing and cohesive devices are used effectively to guide the reader through the logical steps. To reach the highest band, focus on refining minor phrasing choices and eliminating slight grammatical slips in complex relative clauses.
IELTS Writing Criteria Scores
Task Achievement
The response covers all key stages of the process accurately, supported by a clear overall overview and specific numerical details from the diagram.
Ensure all process steps are summarized smoothly without over-describing minor visual details.
Coherence and Cohesion
The overview and detail body paragraphs are logically structured, using sequential transitional phrases to maintain clear progression.
Vary cohesive markers slightly to avoid repetitive structure across transition-heavy process descriptions.
Lexical Resource
A wide range of task-appropriate vocabulary is used with flexibility and precision, such as 'anaerobic environment', 'culminating', and 'transmited'.
Refine occasional word combinations to ensure fully natural collocation throughout.
Grammatical Range and Accuracy
Sentence structures are varied and demonstrate strong grammatical control, particularly in passive voice constructions and complex sentences.
Check prepositional phrases and relative clause structures to eliminate rare minor grammatical inaccuracies.