The IDDSI Framework

UPDATED: Joint statement from the RCSLT and the BDA on the implementation process and manufacturers’ role in IDDSI implementation

NEW:  NHS Improvement Patient Safety Alert: Resources to support safer modification of food and drink (jointly developed with RCSLT and BDA)

The International Dysphagia Diet Standardisation Initiative 

(IDDSI) have published international standardised terminology and definitions for texture modified foods and thickened liquids for people with dysphagia. 

The framework consists of a continuum of eight levels (0-7) and includes descriptors, testing methods and evidence for both liquid thickness and food texture levels. 






















Benefits of IDDSI

a) The framework has been developed after much research and collaboration across the world and each level is based on evidence. The current UK descriptors are based on a consensus of expert opinion not research evidence.

b) The framework is a continuum and contains levels for fluids as well as foods. This means that the safety of patients when both eating and drinking is accounted for and assured. Fluids are not included in the UK descriptors.

c) The framework is being adopted across the world and countries currently implementing it include: USA, Australia, Canada, New Zealand, Germany and China to name but a few. This means that when healthcare workers and patients travel from country to country there will be no confusion about the dysphagia descriptors being used and this in turn means that patient safety is assured.

d) If more countries use the same descriptors i.e. IDDSI then the ability to do larger research studies and systematic reviews is much greater and this means that we will be able to generate more robust evidence about the care of patients with dysphagia.

e) The final benefit of implementing the IDDSI framework is that it gives professionals the opportunity to raise the profile of the care of patients with dysphagia.


UK IDDSI Expert Reference Group

The RCSLT belongs to a UK Expert Reference Group which was initially set up by NHS England. Subsequently the chairmanship of the group was transferred to both the RCSLT and the British Dietetics Association (BDA). The group comprises: RCSLT, BDA, HCA, NACC, BSNA, manufacturers of thickening agents and products designed specifically for people with dysphagia and manufacturers of modified texture pre-prepared meals.

The group has spent over a year gathering evidence to determine whether or not to adopt the IDDSI framework and this work has included literature reviews, pilots, a pros and cons exercise and surveys of healthcare professionals. In August 2017, the BDA surveyed dietitians to find out their views on the possible adoption of IDDSI and the RCSLT did a similar exercise with its membership.

Following the comprehensive analysis of this evidence, the results were presented to the RCSLT and BDA.  Both the RCSLT and BDA have independently and formally announced that they support the adoption of the IDDSI framework. 

Letter of confirmation of the RCSLT’s adoption of the framework

The BDA and RCSLT see the adoption of the IDDSI framework as of great benefit to patients and carers alike for the following reasons:

  • Improvement of patient safety (e.g. when patients, carers and /or healthcare professionals travel from one country to another there will be common international terminology which should mean that patients continue to receive the correct textures and hence remain safe; product labels will also be international).
  • Greater opportunities to collect and evaluate treatment outcomes (due to international standardised terminologies, larger cohorts of patients can be compared in research to evaluate the effects of existing and new treatments).
  • The combination, within one framework or continuum, of descriptors for both texture modified food and fluids – the latter are not currently addressed by the UK descriptors.


Implementation of the IDDSI framework

What is the timeframe for implementation of IDDSI framework?

The UK Expert Reference group has agreed the following timeframe for implementation:













Download the IDDSI Adoption A4 Flyer

Implementation Toolkit

The UK Expert Reference group is currently developing an implementation toolkit to assist healthcare professionals to implement the IDDSI framework safely and efficiently in their local settings.

The aim is that the complete toolkit will be available by April 2018. However, the toolkit (below) is being added to in real time and so do check this webpage regularly to find any new items.

The toolkit will comprise:

The IDDSI website has a number of resources that local implementation teams may find useful including: 

  • published research articles
  • reports
  • posters
  • a general FAQ section
  • Information about drink and food testing methods with accompanying videos are available.

YouTube videos

Explanation of the UK perspective of the IDDSI Framework

UK National Descriptors: Different interpretations

PowerPoint presentation

Comparison of the UK National Descriptors with IDDSI (both liquids and foods) 

Case studies

Implementing the International Dysphagia Diet Standardisation Initiative (Gateshead Health NHS Trust, Community Services)

Keep up-to-date with the latest developments of IDDSI

IDDSI has a monthly e-newsletter providing the latest information about the Framework. To receive the latest news please subscribe here.

If you have any questions directly related to the Framework, please contact

If you have any other questions, please email Louise Borjes.

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