The phrase "a decision which affects" is correct and usable in written English.
It can be used when discussing the impact or consequences of a particular decision on individuals, groups, or situations.
Example: "The committee made a decision which affects the entire community, and we must consider all viewpoints."
Alternatives: "a decision that influences" or "a decision impacting".
"What's at stake here is the future of these islands – we're about to make a decision which affects them.
"In light of WWOR's decision to drop their nightly news programming, a decision which affects millions of New Jerseyans, it is becoming increasingly critical that the F.C.C. make a determination about WWOR's license and whether they are adequately serving New Jersey as the law and F.C.C. rules stipulate," Mr. Menendez wrote to Mignon L. Clyburn, the acting chair of the commission.
It will thrash out problems caused when the British government takes a decision which affects something which is the assemblies' responsibility, and will discuss the treatment of devolved matters in different parts of Britain.The proposed committee, assuming that the assemblies agree to it, will operate rather like the European Council of Ministers.
In the wake of the controversial decision, Mr Brown complained that the Scottish government was given no warning of a decision which affects the country.
The publisher's works were heavily scrutinized or censored, and the state's attorney in Offenburg charged Schauenberg with "vilification of religion and offending public decency through indecent writings" — a decision which affected Busch.
The screening process serves to block dangerous or irresponsible candidates, but also underscores for applicants and their families that bringing home a gun is a serious decision which affects the entire household, and indeed the entire community.
Councillor Heenan said it was "an unfortunate" decision which affects the 300,000 people the hospital served.
Even in cases in which the foetus has no chance of survival, the abortion decision is a life and death decision which affects the woman's biological and existential condition.
Normally, a die-casting die-design expert invests a lot of time, effort and resources to take this decision, which affects the part manufacturing lead time and cost.
The European Union applauded the decision, which affects steel producers in France, Italy, Sweden, Germany and Britain.
But for all the confusion brought by Toyota's decision, which affects eight models, dealers said they were trying, as much as possible, to operate normally.
