Mixing methods compared: straight dough, sponge-and-dough, Chorleywood and activated dough development

Side-by-side flow diagrams of four industrial bread mixing methods: straight dough, sponge-and-dough, Chorleywood (CBP), and activated dough development (ADD), each showing stages and approximate timings

1. Why the mixing method matters

Every bread recipe contains the same core ingredients — flour, water, yeast and salt — but bakers in different settings, using different equipment and serving different markets, arrive at very different end products from the same starting point. The difference is largely the mixing method: the sequence, duration, and mechanical intensity of the steps that transform those raw materials into developed dough.

Mixing is where four separate phenomena happen simultaneously:

1. Hydration — flour proteins absorb water and begin to associate.
2. Gluten formation — gliadin and glutenin proteins unfold and link through hydrogen bonds and disulphide bonds to form the elastic gluten network.
3. Aeration — air is incorporated into the dough and subdivided into small bubbles by the mechanical action of the mixer; these bubbles become the nuclei of the gas cells that expand during proofing and baking.
4. Distribution — yeast, salt, fat and improver ingredients are evenly dispersed throughout the dough mass.

The mixing method determines how much mechanical energy is used to achieve these four goals, and what chemical or biological assistance (fermentation time, improver ingredients) compensates for what the mixer does not do on its own. Get the balance wrong, and you have dense bread, poor flavour, premature staling, or — on a production line — inconsistent loaves that reject at quality control.

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2. Gluten development science in brief

Line graph showing dough resistance over mixing time with four labelled phases: Incorporation (rising line), Development (steep rise), Optimal (plateau at peak), Over-mixed (falling line). A small dough cross-section sketch accompanies each phase.

Understanding the four stages of gluten development gives you the framework to diagnose mixing problems regardless of which method you use.

Stage 1 — Incorporation: Flour and water combine. The mass looks rough and shaggy. Proteins are absorbing water but have not yet aligned or formed bonds. Resistance to the mixer is low.

Stage 2 — Development: The dough smooths out and begins to pull away from the bowl walls. Gluten proteins align and crosslink — both the weak bonds (hydrogen bonds, which form quickly) and the stronger disulphide (S–S) covalent bonds (which require more time and energy). Resistance increases.

Stage 3 — Optimal: The dough is smooth, slightly tacky, elastic and extensible. It passes the windowpane test (a small piece can be stretched thin enough to be translucent without tearing). Gas-bubble nuclei are maximised. This is the target state for most bread doughs.

Stage 4 — Over-mixing: With continued mixing the gluten network begins to break down. The dough becomes sticky, slack and weak. Gas retention deteriorates. Over-mixed dough cannot be recovered by rest or re-mixing.

Key implication: A method that develops dough quickly and mechanically (CBP) must not over-mix and must not rely on post-mix fermentation time to finish the job. A method that uses long fermentation instead of intensive mixing (straight dough, sponge-and-dough) completes part of gluten development enzymatically during the bulk rest period, so mixing can be shorter.

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3. Method 1: Straight dough

The straight dough method combines all ingredients — flour, water, yeast, salt, fat and improver — in a single mixing stage. There are no pre-ferments, no two-stage processes.

How it works

1. Mix: All ingredients are combined and mixed until full gluten development (smooth, elastic dough). On a spiral mixer, this typically means 4–6 minutes at slow speed (incorporation) followed by 4–8 minutes at fast speed (development). Exact time depends on mixer type, bowl loading, dough temperature and hydration.

2. Bulk fermentation: The dough rests in bulk — typically 1–3 hours at 26–28°C — while yeast produces CO2, ethanol and flavour compounds. During this time enzymatic protease activity also slowly relaxes the gluten slightly, aiding extensibility and final proof volume.

3. Divide → Round → Intermediate proof → Mould: Each dough piece is scaled and rounded, rested for 10–15 minutes (intermediate or "first" proof) to relax before final shaping.

4. Final proof: Shaped pieces prove at 35–40°C / ~85% RH until approximately 80–90% of final baked volume.

5. Bake: Pieces enter the oven. Oven spring (rapid expansion in the first 5–10 minutes) completes gas cell inflation before crust sets.

Characteristics and when to use it

The straight dough method is the most straightforward approach — fewer steps, less equipment, and a single mixing operation to manage. It is suited to:

• Artisan and craft bakeries producing small to medium batches
• High-hydration speciality breads (ciabatta, focaccia, pizza) where long bulk fermentation builds flavour alongside structure
• Rye and wheat-rye breads (where a different set of rules apply — see Section 7)
• Any bakery wanting flexibility: the fermentation time can be adjusted day-to-day to suit production schedule

The main limitation is flour sensitivity: straight dough has less buffer against flour variability than CBP or sponge-and-dough. If the flour's protein level or enzyme activity changes between deliveries, the bread quality changes with it. Adding a bread improver significantly reduces this sensitivity.

Straight dough in practice — the ciabatta example

The IREKS Ciabatta Mix demonstrates straight dough in a high-hydration application:

• Recipe: 5.000 kg Ciabatta Mix + 0.100 kg fresh yeast + 0.075 kg olive oil + 3.500 kg water
• Mixing: spiral mixer, 5 min slow + 7 min fast
• Target dough temperature: 28°C
• Bulk fermentation: 60–90 min
• Final proof: 30–40 min
• Bake: 225–230°C, 25 min, full steam

At approximately 70% hydration (water relative to mix weight), ciabatta dough is too soft to shape conventionally — it is folded, not moulded, and handled with minimal mechanical intervention after bulk fermentation. The long bulk fermentation develops flavour and builds extensibility from enzymatic activity.

Focaccia variant: The same Ciabatta Mix recipe with water reduced to 65%, bulk fermentation shortened to 30 minutes, and the shaped dough proved in oiled hoops with an olive oil and rock salt topping. Different hydration and rest time give a completely different product character from the same base mix.

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4. Method 2: Sponge-and-dough

The sponge-and-dough method uses a pre-ferment (the sponge) as a first stage before the final dough is assembled. It is the oldest of the four methods described here and was the dominant approach in British plant bakeries before the Chorleywood Process arrived.

How it works

1. Build the sponge: A portion of the total flour — typically 50–70% — is mixed with most or all of the yeast and enough water to form a stiff-to-medium dough. It is mixed briefly (2–3 minutes, just enough to hydrate) and left to ferment.
2. Ferment the sponge: The sponge ferments at approximately 23–26°C for 3–6 hours, or overnight at approximately 18–20°C for more complex flavour. During this time the sponge rises, reaches its peak (dome), and may begin to recede. Yeast multiplies; organic acids accumulate; the gluten in the sponge partially develops through enzymatic protease activity.
3. Final mix: The mature sponge is added to the remaining ingredients (the balance of flour, salt, fat, remaining water, improver if used) and mixed to full development.
4. Short floor time, then proceed as straight dough: Because the sponge has done much of the fermentation work, only a short floor time (15–20 minutes) is needed before dividing. The rest of the process — divide, round, intermediate proof, mould, final proof, bake — is the same as straight dough.

Why use sponge-and-dough?

Two bowls side by side: left shows a freshly mixed sponge, right shows the same sponge after 4 hours of fermentation at 26°C, demonstrating characteristic dome and bubble structure

Flavour: Longer fermentation of the sponge produces a richer palette of flavour compounds — ethanol, organic acids (lactic and acetic), esters and carbonyl compounds — compared to the shorter fermentation in a straight dough process.

Dough tolerance: The sponge's organic acids slightly lower the pH of the final dough, which tightens gluten slightly and improves its stability in the prover. The baker gets a wider window between ideal and over-proof.

Flour flexibility: The long sponge fermentation allows weaker flours to develop more fully. A straight dough of the same flour might produce an under-developed crumb; the sponge gives the gluten time to mature.

Better keeping: Lower pH, more organic acids, and more complex crumb structure from the long fermentation all contribute to modest improvements in mould resistance and perceived freshness over the following 24–48 hours compared to CBP bread.

The scheduling tradeoff

Sponge-and-dough is demanding to schedule. The sponge must ferment for 3–6 hours and be used at its peak. This means either building the sponge the previous evening (overnight ferment) or starting production many hours before the first bake. For bakeries with limited fermentation vessel space, sponge management can become a bottleneck.

Adding a ready-to-use dried sourdough to shortcut the sponge

For bakeries that want the flavour contribution of a pre-ferment without the scheduling burden, dried fermented wheat products like Aromaferm Wheat & Malt Ferment 110 offer a practical alternative.

Aromaferm is:

• A dried wheat sourdough (90–100% wheat malt + 5–10% wheat milling products, fermented and spray-dried)
• Used at 1–5% on flour weight — lower for background malty-acidic notes, higher for a pronounced fermentation character
• pH approximately 3.3 and Total Titratable Acidity 110 ± 10%
• Declared on label as "Dried Wheat Sourdough" — transparent and consumer-friendly
• Suitable for vegetarian, vegan, Kosher and Halal applications

Allergen and certification: Aromaferm is a wheat-based product (90–100% wheat malt), making wheat a declared major allergen in any end product under UK FIR 2014 and EU Regulation (EC) 1169/2011 Annex II. The vegetarian, vegan, Kosher and Halal suitability claims above are from a 2018 product specification. Certification status must be verified with a current certificate from the supplier (AB Mauri) before these claims are used in any product marketing or labelling.

When added to a straight dough, Aromaferm introduces the acidic and aromatic character of a mature pre-ferment without requiring a separate fermentation vessel or hours of scheduling. It does not replace the structural changes in gluten that a live sponge provides, but it delivers the flavour profile that makes sponge-and-dough bread distinctive. See the formula card below.

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5. Method 3: Chorleywood Bread Process (CBP)

The Chorleywood Bread Process is the most significant technical development in commercial bread production in the twentieth century, and it dominates large-scale industrial bread production in the UK.

Origins

CBP was developed in 1961 at the British Baking Industries Research Association (BBIRA) in Chorleywood, UK — the organisation that became Campden BRI. Its inventors observed that if sufficient mechanical energy was input to dough in a very short time, full gluten development could be achieved in minutes rather than hours, eliminating the need for bulk fermentation.

The science of intensive mechanical development

Where straight dough development relies on energy over time (mechanical + enzymatic), CBP relies on energy input per unit time: very high power in a very short period.

The typical CBP energy input is approximately 11–13 Wh/kg (approximately 40–47 kJ/kg) of dough. This is achieved in 3–5 minutes using twin-rotor or high-speed intensive mixers that run at speeds far higher than conventional spiral mixers. The intense mechanical action:

• Forces water into the protein matrix at a rate faster than passive absorption
• Aligns gluten proteins and forms disulphide bonds much more rapidly
• Subdivides air into very fine, uniform bubbles — producing CBP's characteristic fine, uniform crumb

What CBP requires in the formula

CBP cannot work with flour, water, yeast and salt alone. Two additives are mandatory:

Ascorbic acid (E300): Approximately 50–75 ppm on flour weight — though this figure is single-source and actual levels vary by flour. Ascorbic acid is converted in wet dough to dehydroascorbic acid (DHAA), which rapidly oxidises gluten SH groups, forming S–S crosslinks that strengthen the gluten network during the intense mixing phase. Without this oxidant, the intensive mixing would produce a dough that is mechanically developed but structurally weak.

Fat: Typically 0.7–1% on flour weight. Fat promotes fine gas bubble dispersion and improves crumb softness. In the absence of bulk fermentation, fat also plays a larger role in crumb tenderness than it would in a sponge-and-dough system.

Higher yeast: Because there is no bulk fermentation to develop CO2 progressively, CBP dough uses more yeast (typically 2.5–3% fresh yeast ) to compensate.

No bulk fermentation

After intensive mixing, CBP dough proceeds almost immediately to the divider — with only a very short "floor time" of approximately 5–10 minutes before dividing. There is no bulk fermentation phase. This is what makes CBP so time-efficient compared to straight dough or sponge-and-dough.

Advantages and trade-offs

CBP and flour variety selection

One often-overlooked advantage of CBP is that it enables use of Group 2 and some Group 3 UK wheat varieties — wheats with moderate or lower protein that would not develop adequately in a straight dough or sponge system. The mechanical energy compensates for what the protein cannot provide. This has significantly influenced the economics of UK wheat production since 1961, because farmers can grow higher-yielding lower-protein varieties and still sell into the bread market.

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6. Method 4: Activated Dough Development (ADD)

Activated Dough Development is a chemical-assist method designed to achieve good gluten development in standard mixers without the capital cost of intensive CBP equipment and without the long bulk fermentation of straight dough or sponge-and-dough.

The method uses a two-part chemistry: first weaken the gluten, then re-strengthen it.

How ADD works

Step 1 — Reduction (weakening): L-cysteine (E920) — or glutathione from inactive (autolysed) yeast as a clean-label alternative — is added to the dough. L-cysteine cleaves disulphide bonds in gluten proteins through thiol-disulphide exchange, making the gluten network more extensible and reducing its resistance to the mixer. This means less mechanical energy is needed to develop the dough.

Step 2 — Re-oxidation (re-strengthening): Ascorbic acid (E300) is added simultaneously. As the dough is mixed (briefly, typically 3–5 minutes in a standard mixer), the ascorbic acid is converted to dehydroascorbic acid and re-forms S–S crosslinks in the relaxed gluten, rebuilding network strength to the target level.

The result is a dough that is fully developed in a short time with standard equipment — mechanically equivalent (though not organoleptically equivalent) to CBP output.

Where ADD fits in practice

ADD occupies the middle ground:

• Above straight dough: less time, less fermentation needed
• Below CBP: less equipment investment, lower throughput

It is particularly suitable for:

• Medium-scale plant bakeries with conventional spiral mixers that cannot justify CBP intensive mixer investment
• Pizza and flatbread production where the L-cysteine relaxation is a direct benefit (extensible, easy-to-sheet dough) rather than a step on the way to a re-strengthened loaf
• High-protein flours where gluten is naturally very strong and needs softening to achieve adequate extensibility for moulding

ADD: labelling and sourcing considerations

Allergen/dietary claim: L-cysteine (E920) can be derived from animal hair or feathers. Synthetic or fermentation-derived L-cysteine is available from some suppliers. Before declaring an ADD bread as Halal, Kosher or vegan, verify the source of E920 used in the improver or added directly to the dough.

Inactive yeast (as a glutathione source) avoids this issue entirely — it must be declared on the ingredient label as "yeast extract" or "inactive yeast" but carries no Halal/vegan complication.

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7. Comparing all four methods

See the detailed comparison table below. The following is a summary of the key differentiators:

Two sliced loaves side by side: left shows a fine, uniform crumb typical of Chorleywood Process white bread; right shows an open, irregular crumb with larger holes typical of slow-fermented artisan bread

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8. Bread improvers across all four methods

The role and optimal formulation of a bread improver differs significantly depending on the mixing method. The comparison table below provides full detail. The key principles:

Straight dough: buffer against flour variability

A standard general-purpose improver such as Zeelandia Gamma GP provides:

• Ascorbic acid (E300) to strengthen gluten during mixing
• A wheat-derived enzyme to improve extensibility and volume
• Rapeseed oil to aid gas bubble stability

The Gamma GP is dosed at 0.5–0.75% on flour for white tin bread, rising to 1% for bloomers, 1.5% for soft rolls and 2% for crusty rolls and wholemeal. The higher dose for wholemeal and crusty products reflects their greater need for gluten support — bran particles cut through the gluten network, requiring more oxidant and enzyme activity to compensate.

Allergen cross-contamination declaration: The February 2020 Gamma GP specification lists egg and sesame among cross-contamination allergens. Current product listings accessed June 2026 show a different allergen set (cereals containing gluten, soya, milk; may contain lupin) and do not list egg or sesame. This discrepancy must be resolved with Zeelandia using a current specification before Gamma GP is included in any product with allergen declarations or free-from claims.

Sponge-and-dough: lighter improver touch

In a well-managed sponge-and-dough system, the fermentation itself provides some gluten development and flavour. The improver can therefore be lighter — lower in oxidant, focused more on emulsifiers for crumb softness and shelf life than on structural support.

CBP: improver is central to the process

CBP is essentially built around a bread improver. The ascorbic acid that is mandatory for CBP is almost always delivered via a commercial improver formulated for intensive mixing. Additional elements — fat (for gas stability), DATEM E472e (for dough tolerance), maltogenic amylase (for anti-staling) — are typically also included.

For rye and mixed-grain breads where emulsifier-free labelling is important, a product like Zeelandia Optimax Free provides the structural support through vital wheat gluten (50%) as its base, plus ascorbic acid and enzyme, with no emulsifiers. Its mixing protocol — 8 minutes slow + 2 minutes high speed, dough temperature 28°C, first proof 15 minutes — is a textbook straight-dough approach for rye-dominant formulas.

ADD: the improver IS the method

In ADD the improver is not supplementary — it defines the process. The L-cysteine (or inactive yeast) and ascorbic acid that characterise ADD are always delivered as part of a purpose-formulated improver blend. The baker is buying both a processing aid and a method.

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9. Critical process parameters

The following parameters apply across all four methods. See the table below for full detail with sources.

Desired Dough Temperature (DDT)

Target: 26–28°C

Dough temperature governs fermentation speed more than any other single parameter. A dough at 24°C will ferment significantly more slowly than one at 28°C. In the bakery, DDT is controlled by adjusting the temperature of the mixing water. The formula to calculate required water temperature is:

Water temp (°C) = (DDT × 3) − flour temp − room temp − friction factor

where friction factor (heat generated by mixing) is typically 4–10°C for standard spiral mixers and higher for intensive CBP mixers.

Proofing conditions

Final proof: 35–40°C / approximately 85% RH

Exceeding 40°C risks killing yeast cells near the surface and producing off-flavours through rapid fermentation. Below 35°C slows production significantly. The 85% RH target prevents surface skinning, which would restrict oven spring; excessive humidity leads to condensation and a sticky, wet surface.

Steam in the oven

Steam for approximately the first 5–8 minutes of baking, then vented.

Steam delays crust formation, allowing the full oven spring (dough expansion from CO2 and steam expansion inside the dough) to complete before the crust sets. Venting steam after the initial phase allows the crust to dehydrate, colour through the Maillard reaction, and develop the characteristic crunch of a well-baked crust.

Internal temperature

Target core temperature: 93–99°C for lean and crusty bread types (baguettes, sourdough, tin bread). Enriched doughs (sandwich loaves, soft rolls — containing milk, sugar or elevated fat) are typically done at 88–93°C. Below these thresholds, starch may not be fully gelatinised throughout the crumb, resulting in a doughy, sticky internal texture that collapses on cutting. These are quality best-practice targets, not statutory minimums — no EU or UK regulation specifies a minimum internal baking temperature for bread.

Starch gelatinisation

Occurs over approximately 56–85°C. The process is:

1. Starch granules absorb water and swell (onset ~ 56°C).
2. Granule structure disrupts and starch chains become mobile (complete ~ 85°C).
3. On cooling, chains begin to re-associate — this is the start of staling.

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10. Staling: why it happens and how method affects it

Staling is primarily caused by starch retrogradation: the re-crystallisation of amylose and amylopectin chains after baking. Freshly baked bread has gelatinised, amorphous starch; over the following hours and days the chains progressively re-order into a stiffer, more crystalline structure, producing a firmer, crumblier crumb.

The refrigerator trap

Staling is fastest near 4°C — refrigeration temperature. At this temperature, the rearrangement of starch chains is maximised. Bread stored at room temperature stales more slowly; frozen bread (at −18°C) stales very slowly because molecular mobility is low, but rapid staling resumes on thawing. This is why bakeries use room temperature or freezing for bread storage, never refrigeration.

See the staling graph below for a visual representation.

How mixing method affects staling rate

Sponge-and-dough bread, with its higher organic acid content from longer fermentation, has modestly better staling resistance than equivalent CBP bread — the lower pH and more complex crumb structure both contribute.

CBP bread and ADD bread require dedicated anti-staling systems because they lack the fermentation benefit:

• Maltogenic amylase — modifies amylopectin chains during baking so they re-crystallise more slowly. This is the most effective anti-staling enzyme in current use.
• Mono- and diglycerides (MDG / E471) — complex with amylose chains during gelatinisation, physically blocking retrogradation.

For artisan straight dough bread with a 2+ hour bulk fermentation, the anti-staling enzyme is optional rather than essential, though it remains beneficial for packaged product.

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11. Common faults by mixing method

See the full fault table below. Below are the most practically important issues for each method:

Straight dough:

• Dense crumb / low volume: Under-mixing (check mixing time and DDT) or under-fermentation (bulk too short or dough too cold).
• Large irregular holes: Over-fermentation in bulk or too long a floor time after dividing. Divide at a more consistent pace and reduce bulk time.

Sponge-and-dough:

• Sponge too acidic / bread collapses: Sponge was past peak when used. Reduce sponge fermentation time, or drop sponge temperature slightly.
• Weak, sticky final dough: Over-fermented sponge has released excessive protease activity. Use sponge at or before its dome peak.

CBP:

• Pallid, bland flavour: Inherent to the method. Mitigate with dried sourdough (Aromaferm) or fermented wheat flour.
• Rapid staling without anti-staling improver: Essential to include maltogenic amylase and/or MDG in the formula.

ADD:

• Slack, spreading dough: L-cysteine overdose or inactive yeast overdose. Reduce reductant level and check formula against supplier technical data.
• Tight, tearing dough during moulding: Insufficient reductant dose; ascorbic acid level too high relative to L-cysteine. Rebalance.

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12. Method selection guide

Choose straight dough when:

• You have a spiral mixer and want a simple, one-stage process
• You are producing artisan or speciality bread where fermentation flavour matters
• You produce rye, ciabatta, baguette or other products where long bulk fermentation is part of the recipe character
• Batch size is small to medium

Choose sponge-and-dough when:

• Flavour complexity is a priority and you can accommodate the 5–8 hour schedule
• You are producing white tin bread, sandwich loaves or bloomers at medium scale
• Your flour protein is moderate and you want to compensate with fermentation time

Choose CBP when:

• You are operating at large plant scale with high throughput targets
• Capital investment in intensive mixing equipment is justified by volume
• Consistent, fine crumb for sliced packaged bread is the target
• Your flour supply includes lower-protein UK varieties

Choose ADD when:

• You need CBP-like speed and consistency but do not have or cannot justify intensive mixing equipment
• You produce pizza, flatbreads or sheeted products where dough extensibility is a premium requirement
• You want a shorter total process than straight dough without investing in a CBP line

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Coverage notes and gaps

This article is solid on:

• The four principal UK industrial methods, their operating principles and comparisons (two or more corroborating sources for all main claims)
• Process parameters: dough temperature, proofing conditions, baking temperatures (high confidence — confirmed by spec sheets and reference sources)
• First-party spec data from IREKS Ciabatta Mix (straight dough example), Zeelandia Gamma GP (general improver dosages), Zeelandia Optimax Free (rye/mix straight dough application), and Aromaferm Wheat & Malt Ferment 110 (dried sourdough addition)
• Staling mechanism and the refrigeration trap (Modernist Cuisine + accepted food science)

This article is thin on:

• CBP energy input (11 Wh/kg): one source only. A visit to Campden BRI documentation or BBIRA original papers would confirm or correct this figure.
• CBP market share: the widely cited "80% of UK plant bread" figure could not be directly attributed to a primary or trade body source during this research. The article states "majority" rather than a percentage.
• CBP ascorbic acid dosage (50–75 ppm): one source only. Supplier technical sheets for CBP-specific improvers would confirm.
• Retarded fermentation (overnight retard) is only briefly mentioned — a dedicated article in A5 on cold and retarded dough processes would complement this one.
• No coverage of the No-Time Dough (NTD) method, which uses chemical oxidants without the L-cysteine component — a minor variant but used in some bakeries.
• Sponge-and-dough flour split percentages (50–70%) are from a single FOB source.