The BBC Trust has concluded a review into the Window of Creative Competition (WOCC), part of its commissioning slate.
The first biennial review into the operation of the WOCC has judged that the body is fulfilling its obligation to produce the best possible programmes for audiences, regardless of their makers.
The review added that the WOCC had shown no obvious bias towards in-house production nor independent firms.
Rotha Johnston, who led the review, commented: "The public judge the BBC on the quality of its programmes. For the BBC to produce a wide range of high-quality and distinctive programmes, the commissioning process needs to work effectively.
"Our review has shown that in its first year the WOCC has worked well."
She added: "The review found that commissioning decisions are being made on merit, with independent producers doing well in the WOCC's first year.
"Meanwhile the BBC's in-house teams are responding positively to the challenge of increased competition. Everyone wants the best programmes to be commissioned and there is evidence that the WOCC is playing a part in achieving this."
The BBC charter requires that half of programmes are reserved for in-house production and a statutory quota of 25 per cent is reserved for the independent sector, with remaining 25 per cent - which is known as the WOCC - available to in-house and external producers.
The BBC Trust's recommendations for the improvement of the WOCC included consideration of its applications for sport, the possibility of better labelling of programmes and the need for a review of the complaints procedure for the WOCC.
Take a look back at October's inaugural event.
The film is expected to continue without Mendes' involvement.