Computer Associates International Inc. Thursday said it would cut its work force by about 900 positions, or about 5 percent, to about 17,000.

The cuts, which will be primarily in North America, are effective immediately and will hit all areas of the company, the Islandia, New York-based software maker said in a statement.

The Islandia, New York-based software maker -- which is the world's fourth largest -- said the cuts will be effective immediately, will be primarily in North America and will impact all areas of the company. 

``The changes we are making reflect the complex realities that our company and many other companies are faced with today, and our staffing levels will be more appropriately geared to the new business model we introduced last year,'' Sanjay Kumar, president and chief executive, said in a statement. 

Computer Associates shares finished Thursday's regular session 68 cents higher at $29.70 on the New York Stock Exchange. The stock's value has fallen 24 percent from its year-high of $39.