New Delhi, Oct. 29 -- New Delhi: India's services activity remained broad-based in August, with 17 of 19 sub-sectors recording growth and 13 posting double-digit increases, indicating sustained momentum in formal-sector services despite mixed signals from manufacturing and external trade, showed the Centre's fifth trial Index of Services Production (ISP) on Thursday.

The 19-sector index covering about 60% of the services sector provides a new monthly gauge of activity in a sector that accounts for more than half of India's economy.

The overall ISP will be brought out later after studying the stability and resilience of sub-sectoral ISPs and improving the overall coverage of services, the ministry of statistics and programme implementati...