The phrase "an initial series of" is correct and usable in written English.
It can be used when referring to the first set or group of items, events, or actions in a sequence.
Example: "We will conduct an initial series of tests to evaluate the effectiveness of the new software."
Alternatives: "a preliminary set of" or "an introductory group of".
A gay-rights lawsuit in Hawaii was gaining press coverage as an initial series of preliminary court rulings suggested that gay marriage might be legally conceivable there.
Mrs. Dukakis reported that she had begun to feel better after the first in an initial series of five outpatient ECT treatments given over a two-week period.
Dr. Brandt, who is a paid consultant to Isolaz and received a free device to use in his office, said that treatment requires an initial series of three $500 sessions.
After an initial series of eliminations made by the judges, a final set of 13 participants was selected.
Their research presented the experimental results from an initial series of full-scale shake table tests of a 65 kW wind turbine with a 23 m hub height.
In the second design stage, a validated ligand-based pharmacophore modeling approach was used, taking the newly available inhibition data of an initial series of compounds into account.
Methylation was detected in 8/27 cases (29%), a frequency comparable to the initial series of cases analysed by MSP.
Initial series of experiments are conducted under isothermal conditions.
During the initial series of MCMC iterations, efficiently obtaining the stationary can be challenging.
A retrospective review of an initial consecutive series of 1050 primary DSEK procedures performed by a single surgeon (FWP) between December 2003 and June 2008 identified 80 eyes that remained phakic after DSEK.
Netflix broke with TV industry convention by gambling $100m on committing to an initial two series of House of Cards, a loose remake of the 1990s BBC drama adapted from Michael Dobbs' political thriller, giving Willimon and producer David Fincher, director of The Social Network, the ability to plan the story over 26 hours of programming.
