Algernon Road Hendon, Barnet
49 addresses across 5 postcodes (NW4), about 230 m long, classed as a local road. USRN 20000760.
- Sales: 54 recorded sales since 1995; in 2025 the median was £325,000 across 3 sales.
- Energy: 29 homes have an energy certificate (C: 12, D: 17).
- Flood: 2 addresses on its postcodes are in areas at high or medium risk of flooding from rivers, the sea or surface water.
- Council tax: Most homes around it are in council tax band C; Band D in Barnet costs £2,133 a year in 2026-27.
- Broadband: Gigabit broadband is available to 100% of premises.
- Transport: The nearest railway station is Hendon, about 130 m away in a straight line.
- Green space: The nearest park or garden, Malcolm Park, is about 340 m away.
- Air: Background air pollution in 2024 was 18.4 µg/m³ of nitrogen dioxide and 9.0 of PM2.5, within UK legal limits.
- Height: Its addresses are 57 to 63 m above sea level.
- Noise: 49 of its 49 addresses are modelled at 55 dB or more from road traffic.
- Doctors: The nearest GP surgery is Hendon Way Surgery, about 330 m away, with 5 practices within 1.6 km (1 mile).
- People: About 1,120 people lived in the census areas around it in 2021; 44% of households owned their home and 43% of adults held a degree or other higher qualification.
- Crime: 202 crimes were recorded within 250 m between September 2025 and August 2026, most often anti-social behaviour.
Sales on this street
| Year | Sales | Median price | Lowest | Highest |
|---|---|---|---|---|
| 2025 | 3 | £325,000 | £312,500 | £355,000 |
| 2024 | 2 | £349,250 | £326,000 | £372,500 |
| 2022 | 1 | £399,000 | £399,000 | £399,000 |
| 2021 | 1 | £360,000 | £360,000 | £360,000 |
| 2017 | 2 | £350,000 | £330,000 | £370,000 |
| 2015 | 1 | £260,000 | £260,000 | £260,000 |
| 2014 | 6 | £272,000 | £217,500 | £320,000 |
| 2012 | 1 | £240,000 | £240,000 | £240,000 |
| 2010 | 2 | £243,500 | £240,000 | £247,000 |
| 2008 | 1 | £215,000 | £215,000 | £215,000 |
| 2007 | 6 | £217,250 | £196,000 | £245,000 |
| 2006 | 5 | £200,000 | £192,000 | £223,000 |
| Date | Address | Type | Price | Notes |
|---|---|---|---|---|
| 5 Sep 2025 | 43B NW4 3SY | Flat or maisonette | £312,500 | Leasehold. |
| 28 Mar 2025 | 35A NW4 3TA | Flat or maisonette | £355,000 | Leasehold. |
| 28 Mar 2025 | 38 NW4 3TA | Flat or maisonette | £325,000 | Leasehold. |
| 5 Jun 2024 | 33A NW4 3TA | Flat or maisonette | £326,000 | Leasehold. |
| 3 Jan 2024 | 45A NW4 3SY | Flat or maisonette | £372,500 | Leasehold. |
| 4 Nov 2022 | 30 NW4 3TA | Terraced | £380,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 30 May 2022 | 30 NW4 3TA | Flat or maisonette | £399,000 | Leasehold. |
| 31 Aug 2021 | FLAT 1, 41 NW4 3TA | Flat or maisonette | £360,000 | Leasehold. |
| 26 Oct 2017 | 30 NW4 3TA | Flat or maisonette | £370,000 | Leasehold. |
| 16 Jun 2017 | 36 NW4 3TA | Flat or maisonette | £330,000 | Leasehold. |
| 17 Apr 2015 | 32 NW4 3TA | Flat or maisonette | £260,000 | Leasehold. |
| 31 Mar 2015 | 34A NW4 3TA | Flat or maisonette | £260,000 | Leasehold. Not a standard sale (repossession, buy-to-let or transfer). |
| 2 Oct 2014 | 45A NW4 3SY | Flat or maisonette | £265,000 | Leasehold. |
| 30 Jul 2014 | 32 NW4 3TA | Flat or maisonette | £279,000 | Leasehold. |
| 30 Jul 2014 | 32 NW4 3TA | Flat or maisonette | £255,000 | Leasehold. |
| 26 Jun 2014 | 32A NW4 3TA | Flat or maisonette | £279,000 | Leasehold. |
| 26 Jun 2014 | 32A NW4 3TA | Flat or maisonette | £217,500 | Leasehold. |
| 25 Jun 2014 | 33 NW4 3TA | Flat or maisonette | £320,000 | Leasehold. |
| 26 Apr 2012 | 38A NW4 3TA | Terraced | £240,000 | Leasehold. |
| 26 Aug 2010 | 34 NW4 3TA | Flat or maisonette | £247,000 | Leasehold. |
| 10 Feb 2010 | 37 NW4 3TA | Flat or maisonette | £240,000 | Leasehold. |
| 23 Jan 2008 | 39A NW4 3TA | Terraced | £215,000 | |
| 14 Dec 2007 | 32A NW4 3TA | Flat or maisonette | £210,000 | Leasehold. |
| 4 Dec 2007 | 30 NW4 3TA | Flat or maisonette | £235,500 | Leasehold. |
| 30 Oct 2007 | 38 NW4 3TA | Flat or maisonette | £199,000 | Leasehold. |
| 20 Jul 2007 | 45A NW4 3SY | Flat or maisonette | £196,000 | Leasehold. |
| 17 Jul 2007 | 36 NW4 3TA | Flat or maisonette | £245,000 | Leasehold. |
| 28 Feb 2007 | 35A NW4 3TA | Flat or maisonette | £224,500 | Leasehold. |
| 27 Oct 2006 | 34 NW4 3TA | Flat or maisonette | £218,000 | Leasehold. |
| 29 Sep 2006 | 36 NW4 3TA | Flat or maisonette | £223,000 | Leasehold. |
| 31 Jul 2006 | 35A NW4 3TA | Flat or maisonette | £195,000 | Leasehold. |
| 23 Feb 2006 | 36 NW4 3TA | Flat or maisonette | £200,000 | Leasehold. |
| 20 Jan 2006 | 38A NW4 3TA | Flat or maisonette | £192,000 | Leasehold. |
| 17 Nov 2005 | 34A NW4 3TA | Flat or maisonette | £210,000 | Leasehold. |
| 25 Mar 2004 | 39 NW4 3TA | Flat or maisonette | £200,000 | Leasehold. |
| 27 May 2003 | 36 NW4 3TA | Flat or maisonette | £165,000 | Leasehold. |
| 23 Nov 2001 | 35A NW4 3TA | Flat or maisonette | £147,000 | Leasehold. |
| 27 Jul 2001 | 40A NW4 3TA | Flat or maisonette | £135,000 | Leasehold. |
| 8 Dec 2000 | 45A NW4 3SY | Flat or maisonette | £125,000 | Leasehold. |
| 31 Oct 2000 | 45 NW4 3SY | Terraced | £122,500 | |
| 3 Apr 2000 | 45A NW4 3SY | Flat or maisonette | £107,000 | Leasehold. |
| 11 Feb 2000 | 33 NW4 3TA | Flat or maisonette | £112,500 | Leasehold. |
| 24 Sep 1999 | 35 NW4 3TA | Flat or maisonette | £99,950 | Leasehold. |
| 16 Jul 1999 | 44A NW4 3SY | Flat or maisonette | £95,000 | Leasehold. |
| 18 Dec 1998 | 34A NW4 3TA | Flat or maisonette | £81,500 | Leasehold. |
| 12 Nov 1998 | 31A NW4 3TA | Flat or maisonette | £75,000 | Leasehold. |
| 30 Sep 1998 | 32 NW4 3TA | Flat or maisonette | £71,000 | Leasehold. |
| 18 Jun 1998 | 43A NW4 3SY | Terraced | £69,000 | Leasehold. |
| 30 Apr 1998 | 33 NW4 3TA | Flat or maisonette | £81,250 | Leasehold. |
| 26 Feb 1998 | 45 NW4 3SY | Terraced | £77,000 |
Energy performance certificates
29 homes with a current certificate; median floor area 65 m². Most common: Flat (24); Maisonette, mid-terrace (3); Maisonette, not recorded (1). Built: 1900-1929 (20); 1930-1949 (8); before 1900 (1). Tenure at assessment: rented (private) (18); owner-occupied (6); rented (social) (2).
Each home's certificates and sales (9 addresses)
Council tax
What each band costs in Barnet in 2026-27: Band D £2,133 a year on average, including the police, fire and any county and parish charges.
| A | B | C | D | E | F | G | H |
|---|---|---|---|---|---|---|---|
| £1,422 | £1,659 | £1,896 | £2,133 | £2,607 | £3,080 | £3,554 | £4,265 |
Homes by band in the neighbourhoods around this street: most are in band C (31% of about 1,340 homes).
Planning and heritage
- Conservation area: no postcode centre in this street's postcodes is in one.
- Listed buildings on or by this street: none.
- Article 4 direction (removing permitted development rights): Article 4 Small Houses in Multiple Occupation (HMO) Area 1.
- Tree preservation orders: none recorded, though not every council has published theirs.
- Green belt: no.
Brownfield land registered for housing within 1 km (0.6 miles)
- 94 Audley Road London NW4 3HB: up to 11 homes, permissioned (300 m)
- Phase 3B and 3C, West Hendon Estate, West Hendon, London, permissioned (380 m)
- West Hendon Estate, West Hendon, London, NW9, permissioned (380 m)
- West Hendon Estate, West Hendon, London NW9, permissioned (400 m (0.2 miles))
- West Hendon Estate, West Hendon, London, permissioned (400 m (0.2 miles))
- 117 - 125 West Hendon Broadway, London, NW9 7BP, permissioned (410 m (0.3 miles))
- Upper Welsh Harp, 117-125 West Hendon Broadway, London, NW9 7BP, permissioned (410 m (0.3 miles))
- 107 West Hendon Broadway London NW9 7BN: up to 37 homes, permissioned (440 m (0.3 miles))
Roadworks
No street works under way, planned or finished in the last three months on this street, in permits up to 30 September 2026.
Flood risk
Rivers, the sea or surface water: in this street's postcodes, 0 addresses are in areas at high risk, 2 at medium risk and 0 at low risk. Each address counts once, at the higher of its rivers-and-sea and surface-water risk.
Rivers and the sea alone: no home is in an area at risk.
High: 3.3% (1 in 30) or more chance of flooding a year. Medium: 1% to 3.3%. Low: 0.1% to 1%. Very low: under 0.1%. The rivers and sea figures allow for flood defences. Counts cover whole postcodes, which can include other streets.
Flood zone for planning: no postcode centre on this street is in flood zone 2 or 3.
| Postcode | Planning zone | Addresses at high / medium / low risk | Groundwater |
|---|---|---|---|
| NW4 3TA | not in 2 or 3 | 0 / 2 / 0 | unlikely |
| NW4 3SY | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| NW4 3SX | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| NW4 3PY | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| NW4 3QA | not in 2 or 3 | 0 / 0 / 0 | unlikely |
Height above sea level
The street's 49 addresses are between 57 m and 63 m above sea level (61 m on average); the ground rises about 7 m from the lowest to the highest.
Broadband
| Postcode | Superfast (30 Mbit/s+) | Ultrafast (300 Mbit/s+) | Gigabit | Below 10 Mbit/s |
|---|---|---|---|---|
| NW4 3PY | 100% | 100% | 100% | 0% |
| NW4 3QA | 100% | 100% | 100% | 0% |
| NW4 3SX | 100% | 100% | 100% | 0% |
| NW4 3SY | 100% | 100% | 100% | 0% |
| NW4 3TA | 100% | 100% | 100% | 0% |
Getting around
| Nearest | Distance | |
|---|---|---|
| Railway stations | Hendon 1.0 million journeys in 2024–25 | 130 m |
| Brent Cross West 675,000 journeys in 2024–25 | 1.5 km (0.9 miles) | |
| Cricklewood 859,000 journeys in 2024–25 | 2.9 km (1.8 miles) | |
| Underground, metro or tram | Hendon Central Underground Station | 870 m (0.5 miles) |
| Brent Cross Underground Station | 1.7 km (1 mile) | |
| Colindale Underground Station | 2 km (1.2 miles) | |
| Bus stops | 9 stops within 400 m (0.2 miles), 23 within 800 m (0.5 miles); nearest Hendon Station West Hendon | 90 m |
| Bus or coach station | Finchley Road Underground Station | 5.4 km (3.3 miles) |
| Ferry terminal | London Zoo Waterbus Stop Regents Park | 7.1 km (4.4 miles) |
| Car parks | Brent Cross Shopping Centre Car Park | 930 m (0.6 miles) |
| EV charging points | 15 within 1.6 km (1 mile); nearest ubitricity | 130 m |
| Airport with scheduled flights | London Heathrow Airport LHR | 19.6 km (12 miles) |
Local services
| Nearest | Distance | |
|---|---|---|
| GP surgeries | 5 practices within 1.6 km (1 mile); nearest Hendon Way Surgery | 330 m |
| Pharmacies | 14 pharmacies within 1.6 km (1 mile); nearest Broadway Chemist | 270 m |
| NHS dentists | 13 practices within 1.6 km (1 mile); nearest Sakura Dental Clinic | 280 m |
| Hospital | UCLH Outreach: Bmi The Garden Hospital | 1.8 km (1.1 miles) |
| Police station | Metropolitan police Cadet intake 7/84 | 300 m |
| Cash machines | 2 machines within 800 m (0.5 miles); nearest ATM | 320 m |
Parks and green space
| Nearest | Distance | |
|---|---|---|
| Park or garden | 5 within 800 m (0.5 miles); nearest Malcolm Park 2.0 ha | 340 m |
| Largest park within 800 m (0.5 miles) | Woodfield Park 24 ha | 730 m (0.5 miles) |
| Play area | 4 within 800 m (0.5 miles); nearest Unnamed 810 m² | 390 m |
| Playing field | 1 within 800 m (0.5 miles); nearest West Hendon Playing Fields 28 ha | 680 m (0.4 miles) |
| Allotments | West Hendon Allotments 3.9 ha | 830 m (0.5 miles) |
Within 800 m (0.5 miles): 5 parks and gardens, 28 hectares in all.
Landmarks
The nearest historic landmark is Hoop Lane Jewish Cemetery, a registered park or garden (Grade II), 3 km (1.8 miles) east. 11 listed buildings are within 1 km (0.6 miles).
| Name | What it is | From the middle of the street |
|---|---|---|
| Hoop Lane Jewish Cemetery | Registered park or garden, Grade II | 3 km (1.8 miles) east |
| Name | What it is | From the middle of the street |
|---|---|---|
| Hendon Grove | Wood | 1 km (0.7 miles) north |
| Welsh Harp Reservoir | Lake or reservoir | 1.2 km (0.8 miles) south-west |
| The Decoy | Lake or reservoir | 1.9 km (1.2 miles) north-east |
| Barn Hill | Hill | 3.1 km (1.9 miles) west |
| Little Wood | Wood | 3.2 km (2 miles) east |
| Big Wood | Wood | 3.4 km (2.1 miles) east |
Air quality
| Pollutant | Here | UK limit | WHO guideline |
|---|---|---|---|
| Nitrogen dioxide (NO2) | 18.4 | 40 | 10 |
| Fine particles (PM2.5) | 9.0 | 20 | 5 |
| Particles (PM10) | 15.4 | 40 | 15 |
All three are within the UK legal limits; all three are above the WHO guideline, as in most towns and cities.
Road and rail noise
| Level | Road traffic | Railways |
|---|---|---|
| 70 to 74 | 2 | 0 |
| 65 to 69 | 41 | 10 |
| 60 to 64 | 4 | 38 |
| 55 to 59 | 2 | 1 |
| Under 55 | 0 | 0 |
49 of the street's 49 addresses are modelled at 55 dB or more from road traffic, and 49 from railways, above the WHO guidelines.
Climate, daylight and earthquakes
Monthly temperatures and rainfall, sunrise and sunset through the year, and earthquakes recorded nearby since 1970 are much the same across the area, so they are worked out once for Barnet: see them on the Barnet page.
Nearest schools
| School | Phase | Ages | Distance | Inspection |
|---|---|---|---|---|
| Barnet Hill Academy Islam | Primary | 4–11 | 80 m | No published inspection |
| Parkfield Primary School | Primary | 3–11 | 440 m (0.3 miles) | No published inspection |
| The Hyde School | Primary | 3–11 | 850 m (0.5 miles) | No overall grade (Mar 2025, graded inspection without an overall judgement): Quality of education: Outstanding; Behaviour and attitudes: Outstanding; Personal development: Outstanding; Leadership and management: Outstanding |
| St Joseph's Catholic Primary School Roman Catholic | Primary | 3–11 | 1 km (0.6 miles) | Report card (Jan 2026): Curriculum and teaching: Expected standard; Achievement: Expected standard; Attendance and behaviour: Expected standard; Personal development and wellbeing: Expected standard; Inclusion: Expected standard; Leadership and governance: Expected standard; Early years: Expected standard; Safeguarding standards: Met |
| Colindale Primary School | Primary | 2–11 | 1.3 km (0.8 miles) | No published inspection |
| Sunnyfields Primary School | Primary | 3–11 | 1.4 km (0.8 miles) | Report card (Jul 2026): Curriculum and teaching: Strong standard; Achievement: Strong standard; Attendance and behaviour: Exceptional; Personal development and wellbeing: Strong standard; Inclusion: Strong standard; Leadership and governance: Strong standard; Early years: Strong standard; Safeguarding standards: Met |
| Clarion | Secondary | 11–18 | 1.4 km (0.9 miles) | No published inspection |
| Oliver Goldsmith Primary School | Primary | 3–11 | 1.5 km (0.9 miles) | Good (Nov 2023, overall grade under the previous framework) |
| Hasmonean Primary School Jewish | Primary | 3–11 | 1.5 km (0.9 miles) | No published inspection |
| Hendon School | Secondary | 11–18 | 1.5 km (0.9 miles) | Good (May 2022, overall grade under the previous framework) |
| St Mary's and St John's CofE School Church of England | All-through | 3–18 | 1.5 km (1 mile) | Good (Feb 2024, overall grade under the previous framework) |
| Independent Jewish Day School | Primary | 4–11 | 1.7 km (1.1 miles) | No overall grade (Jul 2025, graded inspection without an overall judgement): Quality of education: Good; Behaviour and attitudes: Outstanding; Personal development: Outstanding; Leadership and management: Good |
Food hygiene ratings nearby
| Business | Type | Distance | Rating | Rated |
|---|---|---|---|---|
| Barnet African Caribbean Association NW4 3TA | Hospitals/Childcare/Caring Premises | 10 m | 5 Very good | 21 Jun 2022 |
| NORTHERN LAND TRUST NW9 6AX | Restaurant/Cafe/Canteen | 170 m | Awaiting inspection | |
| Chicken Cottage NW9 6AG | Takeaway/sandwich shop | 230 m | 3 Generally satisfactory | 9 Dec 2025 |
| 4 In 1 Kebab Takeaway NW9 6AG | Takeaway/sandwich shop | 230 m | 4 Good | 13 Jan 2026 |
| Zaza Cafe Bistro NW9 6AG | Restaurant/Cafe/Canteen | 230 m | 5 Very good | 12 Jun 2026 |
| Daruma NW9 6AG | Takeaway/sandwich shop | 230 m | 3 Generally satisfactory | 9 Dec 2025 |
| The Co-op NW9 7ED | Retailers - other | 230 m | 5 Very good | 28 Nov 2025 |
| Alsdivine Cafe NW9 7ED | Restaurant/Cafe/Canteen | 230 m | 4 Good | 24 Nov 2020 |
| Sahal Cafe Ltd NW9 7ED | Restaurant/Cafe/Canteen | 230 m | 3 Generally satisfactory | 17 Sep 2026 |
| Sangeeth News NW9 6AG | Retailers - other | 240 m | 4 Good | 19 Dec 2025 |
| Melto NW9 7EE | Restaurant/Cafe/Canteen | 250 m | Awaiting inspection | |
| Way2save Supermarket NW9 6AG | Retailers - supermarkets/hypermarkets | 250 m | 5 Very good | 24 Aug 2026 |
| Non-Stop Coffee Shop NW9 6AE | Other catering premises | 250 m | 4 Good | 6 Jun 2026 |
| Tikka Massala NW9 7EE | Takeaway/sandwich shop | 270 m | 5 Very good | 18 Dec 2025 |
| Premier Chicken NW9 7EE | Takeaway/sandwich shop | 270 m | 4 Good | 29 Jan 2026 |
Crime within 250 m
| Category | Crimes |
|---|---|
| Anti-social behaviour | 61 |
| Violence and sexual offences | 58 |
| Criminal damage and arson | 16 |
| Drugs | 15 |
| Vehicle crime | 14 |
| Public order | 10 |
| Other theft | 8 |
| Theft from the person | 7 |
| Burglary | 4 |
| Shoplifting | 4 |
| Robbery | 3 |
| Bicycle theft | 2 |
Most of these are attached to: On or near Herbert Road (67); On or near Mapesbury Mews (26); On or near Bertram Road (26); On or near Mount Road (17); On or near Montagu Road (16).
People and work
Who lives here
| Around this street | England | |
|---|---|---|
| Median age | 36 | 40 |
| Children under 15 | 16% | 17% |
| Aged 65 and over | 12% | 18% |
Homes
| Around this street | England | |
|---|---|---|
| Owned (outright or with a mortgage) | 44% | 61% |
| Owned outright | 25% | 33% |
| Shared ownership | 3% | 1% |
| Social rented | 5% | 17% |
| Private rented | 49% | 21% |
Work and commuting
| Around this street | England | |
|---|---|---|
| Adults (16 and over) in work | 65% | 57% |
| Unemployment (of those working or looking for work) | 6% | 6% |
| Retired (of adults) | 13% | 22% |
| Long-term sick or disabled (of adults) | 2% | 4% |
| Work mainly from home (of those in work) | 33% | 32% |
| Travel to work by car or van | 19% | 48% |
| By train, Underground, metro or tram | 24% | 4% |
| By any public transport, including bus | 37% | 8% |
| On foot or by bicycle | 8% | 10% |
| Work within 10 km (6 miles) of home (of those who travel to work) | 71% | 65% |
| Work 30 km (19 miles) or more away | 3% | 8% |
Education and languages
| Around this street | England | |
|---|---|---|
| Degree or other higher qualification, Level 4+ (of adults) | 43% | 34% |
| No qualifications | 21% | 18% |
| Apprenticeship as highest qualification | 4% | 5% |
| Main language English (aged 3 and over) | 59% | 91% |
| Cannot speak English well or at all | 6% | 2% |
Deprivation
The 2 neighbourhoods around this street are in deciles 3 to 4 of 10 on the English Indices of Deprivation 2025, where 1 is the most deprived tenth of England's 33,755 neighbourhoods and 10 the least.
What has changed
- Food hygiene ratings Stars Pizza (takeaway/sandwich shop, NW9 7DJ) is no longer listed; it was rated 3 Generally satisfactory found 31 October 2026
- Food hygiene ratings Star Pizza (takeaway/sandwich shop, NW9 7DJ) newly listed: Awaiting inspection found 31 October 2026
- Food hygiene ratings Big Boyz (restaurant/cafe/canteen, NW9 7DE) newly listed: Awaiting inspection found 31 October 2026
Postcodes on this street
- NW4 3TA: 33 addresses of 34 in the postcode
- NW4 3SY: 12 addresses
- NW4 3SX: 2 addresses of 54 in the postcode
- NW4 3PY: 1 address of 6 in the postcode
- NW4 3QA: 1 address of 33 in the postcode
Nearby streets
Montagu Road · Station Road · Ingledene Close · Dartmouth Road · Vicarage Road · Mount Road · Bertram Road · Brent View Road · Mapesbury Mews · Herbert Road · Russell Road · Wilberforce Road
What this page cannot tell you
- Whether a particular house is at risk of flooding, subsiding or anything else: the flood map is a model of areas and there is no property-level data here.
- What a home is worth now: sales are historic prices for the homes that happened to sell.
- How safe the street is: crime points are moved to anonymised locations and many crimes are never reported.
- Whether you would get a place at a school: distances are straight lines, not catchments.
- Who lives on the street now: census figures describe the small areas around it in March 2021, during a lockdown.
- How long a journey takes or how often anything runs: transport distances are straight lines to the nearest stops.
- Whether a GP practice is taking new patients, or a dentist new NHS patients.
- How loud a home is inside, or noise from industry, neighbours or smaller airfields: noise figures are models of road, rail and air traffic outside.
How each figure on this page is matched to the street and worked out: methodology.