Wrapping labels in Pane often helps in charts:

labels = Pane[#, ImageSize -> 100] & /@ {"Profit versus Objectives", 
    "Profitability Level", "Payback Period", "Relative Sales", 
    "Relatives Profits", "Sales versus Objectives"};

PieChart[{1/6 - 0.02, 1/6, 1/6, 1/6 - 0.03, 1/6 + 0.03, 1/6 + 0.02}, 
 ChartLabels -> labels, ChartStyle -> {White}, 
 PlotLabel -> "Fianacial Performance", 
 BaseStyle -> {FontWeight -> "Bold", FontSize -> 11, 
   FontFamily -> "Helvetica"}]

Wrapping labels in Pane often helps in charts:

labels = Pane[#, ImageSize -> 80] & /@ {"Profit versus Objectives", 
    "Profitability Level", "Payback Period", "Relative Sales", 
    "Relatives Profits", "Sales versus Objectives"};

PieChart[{1/6 - 0.02, 1/6, 1/6, 1/6 - 0.03, 1/6 + 0.03, 1/6 + 0.02}, 
 ChartLabels -> labels, ChartStyle -> {White}, 
 PlotLabel -> "Fianacial Performance", 
 BaseStyle -> {FontWeight -> "Bold", FontSize -> 11, 
   FontFamily -> "Helvetica"}]

The benefit of using something like Pane is that you can make all labels the same image size and do not have to worry about manually placing line breaks.