LOS ANGELES  Informal talks between representatives of Hollywood’s striking writers and production companies have eliminated the major roadblocks to a new contract, which could lead to a tentative agreement as early as next week, according to people who were briefed on the situation but requested anonymity because they were not authorized to speak.

A deal would end a crippling writers strike that is now entering its fourth month.

The agreement may come without renewed formal negotiations between the television and movie writers and the Alliance of Motion Picture and Television Producers, though both sides still need to agree on specific language of key provisions. If that process goes smoothly, an agreement may be presented to the governing boards of the striking Writers Guild of America West and Writers Guild of America East by the end of next week, the people said.

The breakthrough occurred Friday after two weeks of closed-door discussions between the sides. Even if approved by leaders of the guilds, a deal would require ratification by a majority of the more than 10,000 active guild members.

Writers walked out on Nov. 5 after failing to reach a new contract with producers in months of difficult bargaining. Talks resumed briefly in December, but quickly broke off again. The latest round of talks came more than two weeks ago in the wake of a tentative contract agreement between producers and the Directors Guild of America.