Bob Fernley is adamant Force India made the right decision switching their focus to 2014 even in light of their recent slump.
Force India made a flying start to this season, netting 59 points in the first half of the Championship. This put the Silverstone-based outfit fifth on the log and even ahead of the Championship-winning McLaren team.
Force India's fortunes, though, suffered a massive downward spiral from Hungary onwards when Pirelli changed to more durable tyres in the wake of blow-outs and complaints.
Since then the team has scored just three points and have dropped to sixth in the standings and now find themselves coming under pressure from the much-improved Sauber team.
"We did all the right things to be ahead of the game and circumstances want against us on something that we couldn't control," deputy team principal Fernley told Autosport.
"The plan is absolutely in place for the 2014 programme, so there is no deflection from that.
"It's just a bit frustrating when we had such an incredible start and expected to be able to continue it.
"We believed we were capable of challenging for fifth place [in the constructors' Championship] and to find that we are now desperately trying to defend sixth is disappointing."
Fernley pinned a lot of the blame for Force India's slump on the new Pirelli tyres, saying his team and Ferrari have been hit the worst.
"At the point that we made the decision to go to the 2014 car, we did it on the basis that we had performance in hand," he said.
"All of a sudden to lose that and go backwards is very hard to reconcile.
"There is not an awful lot we can do about it and it's the same for everybody.
"But without doubt, Ferrari have also had a hit in the same way that we did.
"Lotus seem to have recovered better but certainly Ferrari and Force India have been badly set back by the tyre change."
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