Table 3.

Suggestions for additional items in TIDieR for use outside trials

Existing TIDieR item	Change	Description and explanation of change	Justification for addition
None	Addition of new item.	Who was involved in the preparation of TIDieR, how they were involved in the intervention/their perspective (e.g. researcher, service deliverer, patient, etc.)?	Increases transparency of reporting. Conveys whose voice the TIDieR description represents
	Voice: Whose voice does this description of TIDieR convey?
None	Addition of new item	(i) What stage of implementation does the TIDieR checklist cover? (ii) Is this a revision of an earlier TIDieR checklist	Increases rigour of reporting. Conveys what stage the intervention has reached using a continuum of implementation research ranging from proof of concept studies through to those focused on implementation at scale and longer term sustainability [32].
	Stage of implementation
10. Modification	Extension of current item.	Create a new column ‘Modification’ and remove 10. Modification	The column will remind people to describe modifications to all the TIDieR items.
	Modifications becomes a column rather than a row
12. How Well (actual)	Extension of current item.	This change would encourage an explanation of the context of the implementation, and any adaptations made as a result. This will complement the Modifications column to convey change in implementation over time.	Understanding of intended and unintended consequences is important. Therefore an additional field to prompt inclusion of these elements might be a valuable addition for this purpose.
	Current text:
	Describe the extent to which the intervention was delivered as planned
	Suggested change:
	Describe the extent to which the intervention was delivered as planned and outline the factors which had an impact on actual delivery.