The phrase "a considerable planning" is not grammatically correct
It is missing a noun after the article "a" and is not a common phrase in written English. Depending on the context, you can use "considerable planning" or "a considerable amount of planning" instead. Here is an example: "Organizing a successful event requires considerable planning and attention to detail."
The results revealed that within the watershed, the forest and soil conditions need a considerable plan for improvement in order to maintain the ecosystem whereas the surface water quality, groundwater quality and the agricultural conditions requires protection as well as enhancement in certain areas.
The government has ordered councils to produce clear local plans detailing the number of homes they will build over the next five years, a process which absorbs considerable planning resources.
The first thing I learned is that an action video takes considerable planning.
In the first, the knappers crafted an Acheulean hand ax (see photo), a symmetrical tool that requires considerable planning and skill.
The decision to become an entrepreneur and create a new business is a deliberate and conscious decision (Wilson et al. 2007) that requires time, considerable planning and a high degree of cognitive processing.
Nat Ostroff of the Sinclair Broadcast Group, which owns 58 stations in 35 markets, said that stations had done considerable planning to ensure a smooth transition on Feb. 17. "A delay would not be welcome for the broadcast stations themselves," Mr. Ostroff said.
Developing, conducting, and evaluating tabletop exercises requires considerable planning and the perspectives of a variety of stakeholders.
The March on Washington may, through the haze of 50 years, have come to seem as if it were a magical bit of serendipity, but just like D-Day or the lunar landing, it required considerable planning and was the culmination of a string of events and decisions.
This phase required considerable planning, which started in October 2011 as a multidisciplinary quality improvement project aimed at improving sepsis management through the implementation of the SSC bundle.
"This conspiracy required very considerable planning, international travel, and the use of a sophisticated, encrypted communications network to try to avoid police surveillance and apprehension".
