[1] PIs employed or studying in, or affiliated with, a Dutch, Spanish or UK institution at the time of submission should submit their proposal/s to the Dutch (NL PC), Spanish (ES CAT) or UK (ING PATT) TAC respectively. A similar rule applies to PIs who are working at foreign institutions based in any of these three countries - they should submit their proposal/s to the TAC of the country in which they are based.

The NL PC cannot accept proposals submitted by PIs employed or studying in a country other than the Netherlands. The ING PATT and ES CAT can accept proposals submitted by PIs employed or studying in a country other than UK and Spain as long as the majority of the collaborators on the proposal are employed or studying in the UK or Spain respectively.

The NL PC, ES CAT and ING PATT can accept proposals from PIs employed or studying at the Isaac Newton Group of Telescopes at the time of submission.

[2] Up to 5% of ING science telescope time is available for large-scale international projects through the International Time Programme (ITP). This time is allocated on an annual basis by the International Scientific Committee (CCI) of the Canarian Observatories. Proposals should be international in their range of participants and must have as principal or co-investigators astronomers from at least three of the seven European countries that are signatories to the Agreements for Cooperation in Astrophysics (Belgium, Finland, France, Germany, Italy, Spain & the UK). The proposal deadlines are usually in February, and the time is usually allocated over the following B and A semesters.

[3] In queue mode the open-time observations are carried out by an ING astronomer on the WHT. Programmes are selected from a queue of previously approved programmes on the basis of various criteria, such as the scientific rank of the programme, visibility of the targets, observing conditions (seeing, sky transparency, sky brightness), airmass limit, etc.

[4] In robotic queue mode the open-time observations are carried out automatically by a software scheduler. Programmes are selected from a queue of previously approved programmes on the basis of various criteria, such as the scientific rank of the programme, visibility of the targets, observing conditions (seeing, sky transparency, sky brightness), airmass limit, etc. and scheduled together with THE survey observations following its observing constraints.