Silver Royd Hill Leeds
91 addresses across 7 postcodes (LS12), about 660 m (0.4 miles) long, classed as a minor road. USRN 23010988.
- Sales: 69 recorded sales since 1995; in 2026 the median was £200,000 across 1 sale.
- Energy: 45 homes have an energy certificate (B: 2, C: 23, D: 14, E: 5, F: 1).
- Flood: 4 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 A; Band D in Leeds costs £2,284 a year in 2026-27.
- Broadband: Gigabit broadband is available to 100% of premises.
- Transport: The nearest railway station is Bramley (West Yorkshire), about 2.2 km (1.4 miles) away in a straight line.
- Green space: There is a small park or garden about 170 m away, and Cliff Park (13 hectares) is about 790 m (0.5 miles) away.
- Air: Background air pollution in 2024 was 12.6 µg/m³ of nitrogen dioxide and 7.5 of PM2.5, within UK legal limits.
- Height: Its addresses are 51 to 114 m above sea level.
- Noise: 70 of its 91 addresses are modelled at 55 dB or more from road traffic.
- Doctors: The nearest GP surgery is Beech Tree Medical Centre, about 850 m (0.5 miles) away, with 4 practices within 1.6 km (1 mile).
- People: About 490 people lived in the census areas around it in 2021; 61% of households owned their home and 32% of adults held a degree or other higher qualification.
- Crime: 52 crimes were recorded within 250 m between September 2025 and August 2026, most often violence and sexual offences.
Sales on this street
| Year | Sales | Median price | Lowest | Highest |
|---|---|---|---|---|
| 2026 | 1 | £200,000 | £200,000 | £200,000 |
| 2025 | 2 | £200,000 | £190,000 | £210,000 |
| 2024 | 1 | £47,500 | £47,500 | £47,500 |
| 2021 | 1 | £185,500 | £185,500 | £185,500 |
| 2019 | 1 | £107,000 | £107,000 | £107,000 |
| 2018 | 2 | £124,000 | £113,000 | £135,000 |
| 2017 | 3 | £120,000 | £68,000 | £170,000 |
| 2016 | 3 | £117,000 | £112,000 | £147,500 |
| 2015 | 1 | £134,500 | £134,500 | £134,500 |
| 2014 | 2 | £70,000 | £47,000 | £93,000 |
| 2013 | 1 | £136,500 | £136,500 | £136,500 |
| 2012 | 1 | £49,995 | £49,995 | £49,995 |
| Date | Address | Type | Price | Notes |
|---|---|---|---|---|
| 6 Feb 2026 | 9 LS12 4RA | Semi-detached | £200,000 | |
| 15 Sep 2025 | 31 LS12 4RA | Semi-detached | £190,000 | |
| 1 Sep 2025 | 73 LS12 4QQ | Semi-detached | £210,000 | |
| 19 Jun 2025 | 45 LS12 4QQ | Terraced | £115,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 20 Dec 2024 | FLAT 2, STONEBRIDGE HOUSE, 81 LS12 4QQ | Flat or maisonette | £47,500 | Leasehold. |
| 14 May 2024 | 49 LS12 4QQ | Terraced | £235,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 28 Apr 2021 | 71 LS12 4QQ | Semi-detached | £185,500 | |
| 11 Dec 2020 | FLAT 1, STONEBRIDGE HOUSE, 81 LS12 4QQ | Flat or maisonette | £67,500 | Leasehold. Not a standard sale (repossession, buy-to-let or transfer). |
| 26 Jun 2020 | FLAT 4, STONEBRIDGE HOUSE, 81 LS12 4QQ | Flat or maisonette | £67,500 | Leasehold. Not a standard sale (repossession, buy-to-let or transfer). |
| 4 Jun 2019 | 37 LS12 4QQ | Terraced | £110,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 8 Feb 2019 | 43 LS12 4QQ | Terraced | £107,000 | |
| 20 Jul 2018 | 69 LS12 4QQ | Semi-detached | £135,000 | |
| 9 Jul 2018 | 83 LS12 4QQ | Detached | £113,000 | |
| 7 Jun 2018 | 65 LS12 4QQ | Terraced | £120,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 11 May 2018 | 55 LS12 4QQ | Terraced | £140,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 9 Feb 2018 | 53 LS12 4QQ | Terraced | £125,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 5 Feb 2018 | 49 LS12 4QQ | Other | £129,500 | Not a standard sale (repossession, buy-to-let or transfer). |
| 12 Oct 2017 | 59 LS12 4QQ | Terraced | £170,000 | |
| 11 Aug 2017 | 63 LS12 4QQ | Terraced | £120,000 | |
| 14 Jul 2017 | FLAT 2, STONEBRIDGE HOUSE, 81 LS12 4QQ | Flat or maisonette | £68,000 | Leasehold. |
| 30 Aug 2016 | 79A LS12 4QQ | Semi-detached | £112,000 | |
| 27 May 2016 | 75 LS12 4QQ | Terraced | £117,000 | |
| 18 Feb 2016 | 83 LS12 4QQ | Detached | £147,500 | |
| 27 Feb 2015 | 67 LS12 4QQ | Terraced | £134,500 | |
| 25 Jul 2014 | 65 LS12 4QQ | Terraced | £105,000 | Not a standard sale (repossession, buy-to-let or transfer). |
| 30 Jun 2014 | FLAT 3, STONEBRIDGE HOUSE, 81 LS12 4QQ | Flat or maisonette | £47,000 | Leasehold. |
| 20 Mar 2014 | 11 LS12 4RA | Semi-detached | £93,000 | |
| 8 Feb 2013 | 71 LS12 4QQ | Semi-detached | £136,500 | |
| 25 Jun 2012 | 1 LS12 4RA | Flat or maisonette | £49,995 | Leasehold. |
| 2 Dec 2011 | 63 LS12 4QQ | Terraced | £103,000 | |
| 15 Aug 2011 | 79B LS12 4QQ | Detached | £185,000 | |
| 14 Jan 2011 | 79 LS12 4QQ | Semi-detached | £99,000 | |
| 4 Feb 2010 | 49 LS12 4QQ | Terraced | £81,500 | |
| 31 Oct 2008 | 75 LS12 4QQ | Semi-detached | £87,500 | |
| 22 Nov 2007 | 79B LS12 4QQ | Detached | £215,000 | |
| 21 Sep 2007 | 55 LS12 4QQ | Terraced | £135,000 | |
| 13 Jul 2007 | 79 LS12 4QQ | Semi-detached | £140,000 | |
| 1 Jun 2007 | 31 LS12 4RA | Semi-detached | £140,000 | |
| 27 Apr 2007 | 53 LS12 4QQ | Terraced | £142,000 | |
| 8 Nov 2006 | 24 LS12 4RA | Terraced | £130,000 | |
| 11 Oct 2006 | 79 LS12 4QQ | Semi-detached | £100,750 | |
| 31 Mar 2006 | FLAT 2, STONEBRIDGE HOUSE, 81 LS12 4QQ | Flat or maisonette | £74,950 | Leasehold. |
| 20 Jan 2006 | 37 LS12 4QQ | Terraced | £108,500 | |
| 27 Oct 2005 | 65 LS12 4QQ | Terraced | £84,000 | |
| 26 Oct 2005 | 24 LS12 4RA | Terraced | £80,000 | |
| 27 May 2005 | 37 LS12 4QQ | Terraced | £90,000 | |
| 28 Jan 2005 | 45 LS12 4QQ | Terraced | £104,000 | |
| 14 Jan 2005 | FLAT 3, STONEBRIDGE HOUSE, 81 LS12 4QQ | Flat or maisonette | £54,000 | Leasehold. |
| 22 Sep 2004 | 53 LS12 4QQ | Terraced | £125,000 | |
| 25 Nov 2003 | FLAT 3, STONEBRIDGE HOUSE, 81 LS12 4QQ | Flat or maisonette | £39,000 | Leasehold. |
Energy performance certificates
45 homes with a current certificate; median floor area 82 m². Most common: Flat (12); House, mid-terrace (12); House, semi-detached (8). Built: 1900-1929 (14); 1950-1966 (10); 1930-1949 (7). Tenure at assessment: owner-occupied (16); rented (private) (8); rented (social) (7).
Each home's certificates and sales (21 addresses)
- 5, Silver Royd Hill
- 7, Silver Royd Hill
- 11, Silver Royd Hill
- 15, Silver Royd Hill
- 24, Silver Royd Hill
- 26, Silver Royd Hill
- 27a, Silver Royd Hill
- 28, Silver Royd Hill
- 35, Silver Royd Hill
- 47, Silver Royd Hill
- 59, Silver Royd Hill
- 67, Silver Royd Hill
- 69, Silver Royd Hill
- 71, Silver Royd Hill
- 75, Silver Royd Hill
- 79, Silver Royd Hill
- 79a, Silver Royd Hill
- 79b, Silver Royd Hill
- 83, Silver Royd Hill
- Flat 2 Stonebridge House, 81, Silver Royd Hill
- Flat 4 Stonebridge House, 81, Silver Royd Hill
Council tax
What each band costs in Leeds in 2026-27: Band D £2,284 a year on average, including the police, fire and any county and parish charges.
| A | B | C | D | E | F | G | H |
|---|---|---|---|---|---|---|---|
| £1,522 | £1,776 | £2,030 | £2,284 | £2,791 | £3,299 | £3,806 | £4,567 |
Homes by band in the neighbourhoods around this street: most are in band A (43% of about 1,550 homes).
Planning and heritage
- Conservation area: no postcode centre in this street's postcodes is in one.
- Listed buildings on or by this street: 2.
- Article 4 direction (removing permitted development rights): none recorded, though not every council has published theirs.
- Tree preservation orders: in a protected area: G4.
- Green belt: no.
Listed buildings
- ROW OF THREE COTTAGES TO THE NORTH WEST OF STONEBRIDGE MILLS, grade II
- ROW OF WORKSHOPS TO THE NORTH OF STONEBRIDGE MILL, grade II
Brownfield land registered for housing within 1 km (0.6 miles)
- Stonebridge Lane LS12: up to 110 homes, permissioned (90 m)
- Former Farnley Working Mens Club, Butt Lane, Farnley, Leeds, LS12 5BD: up to 8 homes, permissioned (820 m (0.5 miles))
- Block 1, Whingate House, Whingate, Armley: up to 34 homes, permissioned (910 m (0.6 miles))
- Moorfield Road / Tower Works: up to 62 homes, not permissioned (1 km (0.6 miles))
Roadworks
No street works under way, planned or finished in the last three months on this street, in permits up to 31 October 2026.
Flood risk
Rivers, the sea or surface water: in this street's postcodes, 2 addresses are in areas at high risk, 2 at medium risk and 4 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 |
|---|---|---|---|
| LS12 4QQ | not in 2 or 3 | 0 / 1 / 0 | unlikely |
| LS12 4RA | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| LS12 4FF | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| LS12 4QN | not in 2 or 3 | 0 / 1 / 0 | unlikely |
| LS12 4FJ | not in 2 or 3 | 2 / 0 / 4 | unlikely |
| LS12 4RH | not in 2 or 3 | 0 / 0 / 0 | unlikely |
| LS12 5RU | not in 2 or 3 | 0 / 0 / 0 | unlikely |
Height above sea level
The street's 91 addresses are between 51 m and 114 m above sea level (77 m on average); the ground rises about 62 m from the lowest to the highest.
Broadband
| Postcode | Superfast (30 Mbit/s+) | Ultrafast (300 Mbit/s+) | Gigabit | Below 10 Mbit/s |
|---|---|---|---|---|
| LS12 4FF | 100% | 100% | 100% | 0% |
| LS12 4FJ | 100% | 100% | 100% | 0% |
| LS12 4QN | 100% | 100% | 100% | 0% |
| LS12 4QQ | 100% | 100% | 100% | 0% |
| LS12 4RA | 100% | 100% | 100% | 0% |
| LS12 4RH | 100% | 100% | 100% | 0% |
| LS12 5RU | 100% | 100% | 100% | 0% |
Getting around
| Nearest | Distance | |
|---|---|---|
| Railway stations | Bramley (West Yorkshire) 336,000 journeys in 2024–25 | 2.2 km (1.4 miles) |
| Headingley 391,000 journeys in 2024–25 | 3.1 km (1.9 miles) | |
| Cottingley 53,000 journeys in 2024–25 | 3.1 km (1.9 miles) | |
| Bus stops | 23 stops within 400 m (0.2 miles), 64 within 800 m (0.5 miles); nearest Farrow Hill Armley | 170 m |
| Bus or coach station | Pudsey Bus Station | 3.4 km (2.1 miles) |
| Car parks | Parking Space to rent Leeds | 1.2 km (0.8 miles) |
| EV charging points | 1 within 1.6 km (1 mile); nearest InstaVolt Charging Station | 740 m (0.5 miles) |
| Airport with scheduled flights | Leeds Bradford Airport LBA | 8.8 km (5.5 miles) |
Local services
| Nearest | Distance | |
|---|---|---|
| GP surgeries | 4 practices within 1.6 km (1 mile); nearest Beech Tree Medical Centre | 850 m (0.5 miles) |
| Pharmacies | 6 pharmacies within 1.6 km (1 mile); nearest Tong Road Pharmacy | 570 m (0.4 miles) |
| NHS dentists | 6 practices within 1.6 km (1 mile); nearest Hq Dental | 250 m |
| Hospital | St Mary's Hospital | 860 m (0.5 miles) |
| Police station | Elland Road Police Station | 3 km (1.9 miles) |
| Cash machines | 1 machines within 800 m (0.5 miles); nearest Stop + Shop Cashzone | 740 m (0.5 miles) |
Parks and green space
| Nearest | Distance | |
|---|---|---|
| Park or garden | 6 within 800 m (0.5 miles); nearest Unnamed 3.4 ha | 170 m |
| Largest park within 800 m (0.5 miles) | Cliff Park 13 ha | 790 m (0.5 miles) |
| Play area | 1 within 800 m (0.5 miles); nearest Unnamed 580 m² | 640 m (0.4 miles) |
| Playing field | 2 within 800 m (0.5 miles); nearest Unnamed 4.1 ha | 710 m (0.4 miles) |
| Allotments | 1 within 800 m (0.5 miles); nearest Unnamed 9,680 m² | 200 m |
Within 800 m (0.5 miles): 6 parks and gardens, 22 hectares in all.
Landmarks
The nearest historic landmark is Armley House (Gott's Park), a registered park or garden (Grade II), 1.6 km (1 mile) north-east. 11 listed buildings are within 1 km (0.6 miles).
| Name | What it is | From the middle of the street |
|---|---|---|
| Armley House (Gott's Park) | Registered park or garden, Grade II | 1.6 km (1 mile) north-east |
| Name | What it is | From the middle of the street |
|---|---|---|
| Little Wood | Wood | 1.1 km (0.7 miles) south |
| Gamble Hill Vale | Valley | 1.1 km (0.7 miles) north-west |
| Beulah Wood | Wood | 1.5 km (1 mile) west |
| Post Hill | Hill | 1.7 km (1 mile) west |
| Ridge Wood | Wood | 1.7 km (1.1 miles) north-east |
| The Goit | Lake or reservoir | 2.2 km (1.4 miles) north-east |
Air quality
| Pollutant | Here | UK limit | WHO guideline |
|---|---|---|---|
| Nitrogen dioxide (NO2) | 12.6 | 40 | 10 |
| Fine particles (PM2.5) | 7.5 | 20 | 5 |
| Particles (PM10) | 11.8 | 40 | 15 |
All three are within the UK legal limits; nitrogen dioxide and PM2.5 are above the WHO guideline, as in most towns and cities.
Road and rail noise
| Level | Road traffic | Railways |
|---|---|---|
| 60 to 64 | 12 | 0 |
| 55 to 59 | 58 | 0 |
| Under 55 | 21 | 91 |
70 of the street's 91 addresses are modelled at 55 dB or more from road traffic, 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 Leeds: see them on the Leeds page.
Nearest schools
| School | Phase | Ages | Distance | Inspection |
|---|---|---|---|---|
| Dixons Unity Academy | Secondary | 11–16 | 430 m (0.3 miles) | Good (Jul 2024, overall grade under the previous framework) |
| Ryecroft Academy | Primary | 4–11 | 520 m (0.3 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 |
| Whingate Primary School | Primary | 3–11 | 560 m (0.3 miles) | No published inspection |
| Lawns Park Primary School | Primary | 3–11 | 1 km (0.6 miles) | Good (Mar 2020, overall grade under the previous framework) |
| Cobden Primary School | Primary | 3–11 | 1 km (0.6 miles) | No overall grade (Jul 2025, graded inspection without an overall judgement): Quality of education: Requires improvement; Behaviour and attitudes: Requires improvement; Personal development: Requires improvement; Leadership and management: Inadequate |
| Greenhill Primary School | Primary | 3–11 | 1.1 km (0.7 miles) | No overall grade (Dec 2024, graded inspection without an overall judgement): Quality of education: Good; Behaviour and attitudes: Good; Personal development: Good; Leadership and management: Good |
| The Farnley Academy | Secondary | 11–18 | 1.1 km (0.7 miles) | Outstanding (Sep 2023, overall grade under the previous framework) |
| Christ Church Upper Armley Church of England Primary School | Primary | 3–11 | 1.2 km (0.8 miles) | Good (Jan 2023, overall grade under the previous framework) |
| Lower Wortley Primary School | Primary | 3–11 | 1.3 km (0.8 miles) | No overall grade (Sep 2024, graded inspection without an overall judgement): Quality of education: Requires improvement; Behaviour and attitudes: Good; Personal development: Good; Leadership and management: Requires improvement |
| Five Lanes Primary School | Primary | 3–11 | 1.5 km (0.9 miles) | No published inspection |
| Christ The King Catholic Primary School, A Voluntary Academy Roman Catholic | Primary | 5–11 | 1.6 km (1 mile) | Report card (Jan 2026): Curriculum and teaching: Expected standard; Achievement: Expected standard; Attendance and behaviour: Strong standard; Personal development and wellbeing: Strong standard; Inclusion: Strong standard; Leadership and governance: Expected standard; Early years: Strong standard; Safeguarding standards: Met |
| St Bartholomew's CofE Voluntary Controlled Primary School Church of England | Primary | 3–11 | 1.7 km (1 mile) | No overall grade (Dec 2024, graded inspection without an overall judgement): Quality of education: Good; Behaviour and attitudes: Good; Personal development: Good; Leadership and management: Good |
Food hygiene ratings nearby
| Business | Type | Distance | Rating | Rated |
|---|---|---|---|---|
| Buzz Bingo LS12 4QN | Pub/bar/nightclub | 150 m | 5 Very good | 14 Nov 2024 |
| JAF Takeaway LS12 4RA | Takeaway/sandwich shop | 320 m | 4 Good | 26 Feb 2026 |
| Sainsbury's LS12 5AS | Retailers - supermarkets/hypermarkets | 330 m | 5 Very good | 19 Aug 2015 |
| The Brick LS12 3TP | Pub/bar/nightclub | 400 m (0.2 miles) | 4 Good | 30 Jul 2010 |
| Heena's Local LS12 3TP | Retailers - other | 400 m (0.2 miles) | Awaiting inspection | |
| Lloyds Pharmacy LS12 5AT | Retailers - other | 430 m (0.3 miles) | Exempt | |
| Heights Local LS12 3SU | Retailers - other | 460 m (0.3 miles) | 5 Very good | 13 Feb 2026 |
Crime within 250 m
| Category | Crimes |
|---|---|
| Violence and sexual offences | 19 |
| Anti-social behaviour | 9 |
| Criminal damage and arson | 6 |
| Other theft | 5 |
| Public order | 3 |
| Vehicle crime | 3 |
| Robbery | 2 |
| Other crime | 2 |
| Burglary | 2 |
| Drugs | 1 |
Most of these are attached to: On or near Farrow Green (12); On or near Park/Open Space (10); On or near Pipe And Nook Lane (6); On or near Silver Royd Place (5); On or near Silver Royd Way (4).
People and work
Who lives here
| Around this street | England | |
|---|---|---|
| Median age | 38 | 40 |
| Children under 15 | 19% | 17% |
| Aged 65 and over | 11% | 18% |
Homes
| Around this street | England | |
|---|---|---|
| Owned (outright or with a mortgage) | 61% | 61% |
| Owned outright | 26% | 33% |
| Shared ownership | under 1% | 1% |
| Social rented | 16% | 17% |
| Private rented | 23% | 21% |
Work and commuting
| Around this street | England | |
|---|---|---|
| Adults (16 and over) in work | 67% | 57% |
| Unemployment (of those working or looking for work) | 5% | 6% |
| Retired (of adults) | 15% | 22% |
| Long-term sick or disabled (of adults) | 6% | 4% |
| Work mainly from home (of those in work) | 28% | 32% |
| Travel to work by car or van | 56% | 48% |
| By train, Underground, metro or tram | under 1% | 4% |
| By any public transport, including bus | 7% | 8% |
| On foot or by bicycle | 7% | 10% |
| Work within 10 km (6 miles) of home (of those who travel to work) | 79% | 65% |
| Work 30 km (19 miles) or more away | 6% | 8% |
Education and languages
| Around this street | England | |
|---|---|---|
| Degree or other higher qualification, Level 4+ (of adults) | 32% | 34% |
| No qualifications | 14% | 18% |
| Apprenticeship as highest qualification | 7% | 5% |
| Main language English (aged 3 and over) | 95% | 91% |
| Cannot speak English well or at all | under 1% | 2% |
Deprivation
The 2 neighbourhoods around this street are in deciles 1 to 7 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
Nothing new since the change feed started on 30 October 2026. New sales and energy certificates, and hygiene ratings, school inspections and flood figures nearby, will be listed here as the sources update.
Postcodes on this street
- LS12 4QQ: 56 addresses of 60 in the postcode
- LS12 4RA: 23 addresses of 24 in the postcode
- LS12 4FF: 7 addresses of 10 in the postcode
- LS12 4QN: 2 addresses of 23 in the postcode
- LS12 4FJ: 1 address of 40 in the postcode
- LS12 4RH: 1 address of 5 in the postcode
- LS12 5RU: 1 address of 34 in the postcode
Nearby streets
Park Meadow Lane · Bobbin Row · Stonebridge Vale · Pipe and Nook Lane · Silver Royd Grove · Silver Royd Place · Silver Royd Avenue · Silver Royd Terrace · Silver Royd Way · Farrow Green · Silver Royd Drive · Scott Chase
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.